I did not visit the museum.

I have not visited the museum.

I have visited the museum.

I have not been to the museum.

have/has + verb + ing

have/has + been + verb

have/has + verb + been

have/has + been + verb(-ing)

I read this book for a week.

I have read this book last week.

I will be reading this book for a week.

I have been reading this book for a week.

We use the Present Perfect Simple to indicate past actions with relevance to the present.

To express habitual actions in the past.

To indicate actions that are currently happening.

To describe actions that will happen in the future.

He has been not working.

She has been studying not.

She has not been studying.

They have not been playing.

have/has

will

was

is

You finished your homework?

Have you finishing your homework?

Have you finished your homework?

Did you finish your homework?

Both tenses are interchangeable and have the same meaning.

The Present Perfect Simple focuses on completed actions with present relevance, while the Present Perfect Continuous emphasizes ongoing actions and their duration.

The Present Perfect Continuous is used for actions that happened in the past without relevance to the present.

The Present Perfect Simple is used only for future actions.

I am completing my homework.

I have completed my homework.

I will complete my homework.

I completed my homework.

Have/Has + been + subject + verbing?

Have/Has + subject + verb + ing?

Subject + have/has + been + verb?

Have/Has + subject + been + verb+ing?

I have traveled to London.

I have not visited Paris.

I have visited Paris.

I have not seen the Eiffel Tower.

Use Simple for actions that are completed in the past.

Use Present Perfect Continuous for actions that will happen in the future.

Use Simple to describe actions that are currently happening.

Use Present Perfect Continuous for ongoing actions or to emphasize duration.

ever, never, just, already, yet, for, since

tomorrow

always

sometimes

She has been studying for her exams.

She will be studying for her exams.

She has studied for her exams.

She is studying for her exams.