No, piston can only be used as a noun.
'Profuse' can only be used as an adjective.
Yes. But only if it is used as a verb.
No. 'Source' can only be used as a noun or verb.
Was (past tense of be) can be used as a linking verb and as an auxiliary verb. It is never an action verb.Linking verb: Bob was a teacher before his retirement.Auxiliary verb: Sheila was driving when the tornado hit.Yes was is a linking verb and it is a past tense of be.
No. Before is not a verb. It is usually used as an adjective or an adverb.
no. it can only be used as a verb
No, piston can only be used as a noun.
No. The word 'only' can be an adjective, conjunction and adverb.
'Profuse' can only be used as an adjective.
The word 'journal' is a noun only in most dictionaries. However, I have been hearing the word journal used as a verb quite often and it may not be long before it is accepted as a verb and listed as a verb in dictionaries. Oxford University Press Dictionary was the only one with journal listed as a verb, others are sure to follow.
it is used to describe a verb usually after the verb or sometimes before it for example: He runs fast. Fast is the adverb that describes the verb, runs.
No, the word "new" is not a verb. It is an adjective used to describe something that has recently come into existence or has not been used before.
The auxiliary verb "did" is used to create questions in the past. It is placed before the subject in the question form.
Yes. But only if it is used as a verb.
No. 'Source' can only be used as a noun or verb.
The tense of the verb "left" in the sentence is past perfect. This tense is formed by using the auxiliary verb "had" before the past participle of the main verb, and it is used to show that an action was completed before another past action.