The present perfect tense of curve is:
The past perfect tense of curve is:
Present perfect tense.
Present Past Future Present Perfect Past Perfect Future perfect Present Progressive Past Progressive Future Progressive Present Perfect Progressive Past Perfect Progressive Future Perfect Progressive Past Emphatic Present Emphatic Conditional
Past perfect, present perfect and future perfect.
Past perfect: had practiced Present perfect: I/We/You/They have practiced He/She/It has practiced
Present Perfect:I/We/You/They have takenHe/She/It has takenPast Perfect:had taken
Present perfect. Present perfect is formed with have / has + past participle. transformed is the past participle of transform
Technically, two (present and past) but commonly, we say there are 12: past simple present simple future simple past continuous present continuous future continuous past perfect present perfect future perfect past perfect continuous present perfect continuous future perfect continuous
Past perfect tense, past perfect continuous tense, present perfect tense, present perfect continuous tense, future perfect tense and future perfect continuous tense.
It is an adverb, not a verb,; it can accompany a Present, a Past, a Present Perfect, a Past Perfect and a Future verb.
The past tense is sped.The present perfect tense is have/has sped.
there are 12 verb tenses not only five. present, past, future. simple-- continuous--perfect-- perfect continuous.
The past perfect tense is 'I had written'.The present perfect tense is 'I/you/we/they have written. He/she/it has written.