pinches is the 3rd person singular form of pinch. It is used with he/she/it or singular noun subjects. The third person singular form is not used in present perfect.
Present perfect is made by using have/has + past participle. The past participle of pinch is pinched.
For third person singular present perfect has is used.
He/she/it has pinched my leg. The broken seat has pinched my leg
The future perfect tense of "pinches" is "will have pinched."
The present perfect tense is Have/Has Hidden.
The present perfect tense is has/have existed.
Was is a past tense conjugation of be. The present perfect tense of be is have/has been.I/We/You/They have beenHe/She/It has been
"have tried" is the present perfect tense.
The future perfect tense of "pinches" is "will have pinched."
I pinch, you pinch, he/she/it pinches We pinch, you-all pinch, they pinch
Present tense
The present perfect tense is Have/Has Hidden.
The present perfect tense is has/have existed.
present tense past tense future tense present perfect tense past perfect tense future perfect tense present progressive tense past progressive tense future progressive tense present perfect progressive tense past perfect progressive tense future perfect progressive tense
Was is a past tense conjugation of be. The present perfect tense of be is have/has been.I/We/You/They have beenHe/She/It has been
The present perfect tense of "are" is "have been."
"have tried" is the present perfect tense.
The present perfect tense of clap is 'have/has clapped'.
The present perfect tense of leave is have/has left. The present perfect tense of eat is have/has eaten.
The past tense is sped.The present perfect tense is have/has sped.