The default grammar for parsing typed commands in play.

§1. Inform comes with no command grammar built in, and Basic Inform defines none either.

Part Six - Grammar

Understand "take [things]" as taking.
Understand "take off [something]" as taking off.
Understand "take [something] off" as taking off.
Understand "take [things inside] from [something]" as removing it from.
Understand "take [things inside] off [something]" as removing it from.
Understand "take inventory" as taking inventory.
Understand the commands "carry" and "hold" as "take".

Understand "get in/on" as entering.
Understand "get out/off/down/up" as exiting.
Understand "get [things]" as taking.
Understand "get in/into/on/onto [something]" as entering.
Understand "get off/down [something]" as getting off.
Understand "get [things inside] from [something]" as removing it from.

Understand "pick up [things]" or "pick [things] up" as taking.

Understand "stand" or "stand up" as exiting.
Understand "stand on [something]" as entering.

Understand "remove [something preferably held]" as taking off.
Understand "remove [things inside] from [something]" as removing it from.

Understand "shed [something preferably held]" as taking off.
Understand the commands "doff" and "disrobe" as "shed".

Understand "wear [something preferably held]" as wearing.
Understand the command "don" as "wear".

Understand "put [other things] in/inside/into [something]" as inserting it into.
Understand "put [other things] on/onto [something]" as putting it on.
Understand "put on [something preferably held]" as wearing.
Understand "put [something preferably held] on" as wearing.
Understand "put down [things preferably held]" or "put [things preferably held] down" as dropping.

Understand "insert [other things] in/into [something]" as inserting it into.

Understand "drop [things preferably held]" as dropping.
Understand "drop [other things] in/into/down [something]" as inserting it into.
Understand "drop [other things] on/onto [something]" as putting it on.
Understand "drop [something preferably held] at/against [something]" as throwing it at.
Understand the commands "throw" and "discard" as "drop".

Understand "give [something preferably held] to [someone]" as giving it to.
Understand "give [someone] [something preferably held]" as giving it to (with nouns reversed).
Understand the commands "pay" and "offer" and "feed" as "give".

Understand "show [someone] [something preferably held]" as showing it to (with nouns reversed).
Understand "show [something preferably held] to [someone]" as showing it to.
Understand the commands "present" and "display" as "show".

Understand "go" as going.
Understand "go [direction]" as going.
Understand "go [something]" as entering.
Understand "go into/in/inside/through [something]" as entering.
Understand the commands "walk" and "run" as "go".

Understand "inventory" as taking inventory.
Understand the commands "i" and "inv" as "inventory".

Understand "look" as looking.
Understand "look at [something]" as examining.
Understand "look [something]" as examining.
Understand "look inside/in/into/through [something]" as searching.
Understand "look under [something]" as looking under.
Understand "look up [text] in [something]" as consulting it about (with nouns reversed).
Understand the command "l" as "look".

Understand "consult [something] on/about [text]" as consulting it about.

Understand "open [something]" as opening.
Understand "open [something] with [something preferably held]" as unlocking it with.
Understand the commands "unwrap", "uncover" as "open".

Understand "close [something]" as closing.
Understand "close up [something]" as closing.
Understand "close off [something]" as switching off.
Understand the commands "shut" and "cover" as "close".

Understand "enter" as entering.
Understand "enter [something]" as entering.
Understand the command "cross" as "enter".

Understand "sit on top of [something]" as entering.
Understand "sit on/in/inside [something]" as entering.

Understand "exit" as exiting.
Understand the commands "leave" and "out" as "exit".

Understand "examine [something]" as examining.
Understand the commands "x", "watch", "describe" and "check" as "examine".

Understand "read [something]" as examining.
Understand "read about [text] in [something]" as consulting it about (with nouns reversed).
Understand "read [text] in [something]" as consulting it about (with nouns reversed).

Understand "yes" as saying yes.
Understand the command "y" as "yes".

Understand "no" as saying no.

Understand "sorry" as saying sorry.

Understand "search [something]" as searching.

Understand "wave" as waving hands.

Understand "wave [something]" as waving.

Understand "set [something] to [text]" as setting it to.
Understand the command "adjust" as "set".

Understand "pull [something]" as pulling.
Understand the command "drag" as "pull".

Understand "push [something]" as pushing.
Understand "push [something] [direction]" or "push [something] to [direction]" as pushing it to.
Understand the commands "move", "shift", "clear" and "press" as "push".

Understand "turn [something]" as turning.
Understand "turn [something] on" or "turn on [something]" as switching on.
Understand "turn [something] off" or "turn off [something]" as switching off.
Understand the commands "rotate", "twist", "unscrew" and "screw" as "turn".

Understand "switch [something switched on]" as switching off.
Understand "switch [something]" or "switch on [something]" or "switch [something] on" as
    switching on.
Understand "switch [something] off" or "switch off [something]" as switching off.

Understand "lock [something] with [something preferably held]" as locking it with.

Understand "unlock [something] with [something preferably held]" as unlocking it with.

Understand "attack [something]" as attacking.
Understand the commands "break", "smash", "hit", "fight", "torture", "wreck", "crack", "destroy",
    "murder", "kill", "punch" and "thump" as "attack".

Understand "wait" as waiting.
Understand the command "z" as "wait".

Understand "answer [text] to [someone]" as answering it that (with nouns reversed).
Understand the commands "say", "shout" and "speak" as "answer".

Understand "tell [someone] about [text]" as telling it about.

Understand "ask [someone] about [text]" as asking it about.
Understand "ask [someone] for [something]" as asking it for.

Understand "eat [something preferably held]" as eating.

Understand "sleep" as sleeping.
Understand the command "nap" as "sleep".

Understand "climb [something]" or "climb up/over [something]" as climbing.
Understand the command "scale" as "climb".

Understand "buy [something]" as buying.
Understand the command "purchase" as "buy".

Understand "squeeze [something]" as squeezing.
Understand the command "squash" as "squeeze".

Understand "swing [something]" or "swing on [something]" as swinging.

Understand "wake" or "wake up" as waking up.
Understand "wake [someone]" or "wake [someone] up" or "wake up [someone]" as waking.
Understand the commands "awake" and "awaken" as "wake".

Understand "kiss [someone]" as kissing.
Understand the commands "embrace" and "hug" as "kiss".

Understand "think" as thinking.

Understand "smell" as smelling.
Understand "smell [something]" as smelling.
Understand the command "sniff" as "smell".

Understand "listen" as listening to.
Understand "hear [something]" as listening to.
Understand "listen to [something]" as listening to.

Understand "taste [something]" as tasting.

Understand "touch [something]" as touching.
Understand the command "feel" as "touch".

Understand "rub [something]" as rubbing.
Understand the commands "shine", "polish", "sweep", "clean", "dust", "wipe" and "scrub" as "rub".

Understand "tie [something] to [something]" as tying it to.
Understand the commands "attach" and "fasten" as "tie".

Understand "burn [something]" as burning.
Understand the command "light" as "burn".

Understand "drink [something]" as drinking.
Understand the commands "swallow" and "sip" as "drink".

Understand "cut [something]" as cutting.
Understand the commands "slice", "prune" and "chop" as "cut".

Understand "jump" as jumping.
Understand the commands "skip" and "hop" as "jump".

Understand "score" as requesting the score.
Understand "quit" or "q" as quitting the game.
Understand "save" as saving the game.
Understand "restart" as restarting the game.
Understand "restore" as restoring the game.
Understand "verify" as verifying the story file.
Understand "version" as requesting the story file version.
Understand "script" or "script on" or "transcript" or "transcript on" as switching the story
    transcript on.
Understand "script off" or "transcript off" as switching the story transcript off.
Understand "superbrief" or "short" as preferring abbreviated room descriptions.
Understand "verbose" or "long" as preferring unabbreviated room descriptions.
Understand "brief" or "normal" as preferring sometimes abbreviated room descriptions.
Understand "nouns" or "pronouns" as requesting the pronoun meanings.
Understand "notify" or "notify on" as switching score notification on.
Understand "notify off" as switching score notification off.

§2. The following provides for the token "[a time period]", which is not in fact used in the default grammar above, but is available for authors.

The understand token a time period is defined by Inter as "RELATIVE_TIME_TOKEN".

§3.

Section 2 - Dialogue-related grammar (for dialogue language element only)

Understand "ask about [concept]" as talking about.
Understand "ask about [visible thing]" as talking about.
Understand "talk about [concept]" as talking about.
Understand "talk about [visible thing]" as talking about.