possible, possibly, was possible, were possible, will be possible, will have been possible.

"possible"的所有形式包括：possible, possibleness, possiblenesses, possiblenesses'。

"Possible"的所有形式通常包括原形（possible）、第三人稱單數(shù)形式的"he/she/it is possible"、現(xiàn)在分詞形式"it is possible to..."、動詞不定式形式"to be possible"和過去式及過去分詞形式"it was possible"。