1)Robert reads a book in the evening.
<span> Robert is reading a book now.</span>
<span> Robert read a book yesterday.</span>
<span> Robert will read a book in the evening.</span>
<span> Robert has already read a book.</span>
<span>
Robert was reading a book when I came.</span>
<span> Robert had read a book by the end of the evening.</span>
<span> Robert will be reading a book tomorrow
at 5.</span>
<span> 2)The students will have a test
tomorrow.</span>
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.
<span>The students will be having a test
tomorrow at 2.</span>
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.
<span>He is talking to his friend about
his problems now.</span>
He has already talked to his friend about his problems.
<span>He had talked to his friend about
his problems by that time.</span>
<span>He was talking to his friend about his problems when I came.</span>
<span>He will be talking to his friend
about his problems tomorrow at 4. </span>