Simple past vs present prefect

Question

I came across these sentences when I was doing self-study. Would you please let me know which one is correct and why.

1. She came here a lot last month.
2. She's been here a lot last month.

1. I saw her during the last few months.
2. I've seen her during the last few months.

I also want to know whether under which circumstances can present perfect and simple present be used interchangeablly.

Thanks

CalifJim · Accepted Answer

Anonymous1. She came here a lot last month.
2. She’s been here a lot last month.

1. She made frequent trips to this place last month.
2. Many times during the last month she has been at this place.

Anonymous
1. I saw her during the last few months.
2. I've seen her during the last few months.
I also want to know whether under which circumstances can present perfect and simple present be used interchangeablly. (One L.)

1. This event happened.
2. I remember having had this experience.

There are no specific circumstances I know of that can be listed under which present perfect and simple past are interchangeable.

CJ

Simple past vs present prefect

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