[DrPhish]

In general, you can drop everything except the jitsugo (verb or adjective most usually) if the other bits can be inferred.

eg: Taberu (eat) or Hayai (fast)

It sounds like cavemen talk if you translate it literally, but it is perfectly valid japanese

[klodolph]

Syntactically we might call "hayai" a verb, which would then be translated as "is fast" rather than just "fast". Semantically, it is an adjective.