Question

I am studying hard for the last three weeks correct the tense

Answer 1

Correct sentence -

I have been studying hard for the last three weeks.

Answer 2

I have been studying hard for the last three weeks.

• When there is a usage of has/have/had, the sentence is said to be in the present/past/future perfect tense.

1. Has is used when a statement is in the present perfect tense. It is used when the subject that it is used with is singular, or when pronouns like he/she/it are used.
2. Have is used when a statement is in the present perfect tense. It is used when the subject that it is used with is plural, or when pronouns like they/you/we/I are used.
3. Had is used in a statement that is in past perfect tense irrespective of the singularity or plurality of the subject.