1)Robert reads a book in the evening.
Robert is reading a book now.
Robert read a book yesterday.
Robert will read a book in the evening.
Robert has already read a book.
Robert was reading a book when I came.
Robert had read a book by the end of the evening.
Robert will be reading a book tomorrow
at 5.
2)The students will have a test
tomorrow.
The students have a test every day.
The students are having a test now.
The students had a test yesterday.
The students have already had a test today.
The students were having a test when I came.
The students will be having a test
tomorrow at 2.
The students had had a test when I came.
3)He talked to his friend about his problems yesterday.
He talks to his friend about his problems.
He will talk to his friend about his problems tomorrow.
He is talking to his friend about
his problems now.
He has already talked to his friend about his problems.
He had talked to his friend about
his problems by that time.
He was talking to his friend about his problems when I came.
He will be talking to his friend
about his problems tomorrow at 4.