Question

give rules of perfect tenses with since/for​

Answer 1

since - used for period of time

for - used for point of time

hope it helps you

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Answer 2

Answer:

Present perfect tense :-

Has/have +verb 3rd form...

Past perfect tense :-

Had /Verb 3rd form...

Future perfect tense :-

Will have /shall have +verb 3rd form.....

One thing since /for used in perfect continuous tense.......