An understanding of different tense forms is essential to change a sentence from one tense to another tense. Here is a quick overview of various tense forms.

Simple present: infinitive with or without the marker -s

• She enjoys cleaning.
• I enjoy cleaning.

Present continuous: is/am/are + ing form.

• She is enjoying her holidays.
• I am enjoying my holidays.
• They are enjoying their holidays.

Present perfect: has / have + past participle

• She has enjoyed her holidays.
• I have enjoyed my holidays.
• They have enjoyed their holidays.

Present perfect continuous: has / have + been + ing form

• I have been enjoying my holidays.
• He has been enjoying his holidays.

Simple past: v2

• I enjoyed my holidays.
• She enjoyed her holidays.

Past continuous: was / were + ing form

• She was enjoying her vacation.
• You were enjoying your vacation.

Past perfect: had + past participle

• I had enjoyed my holidays.
• She had learnt her lessons.

Past perfect continuous: had + been + ing form

• I had been enjoying my holidays.
• She had been enjoying her holidays.

Simple future: will/shall + infinitive

• She will come.
• They will enjoy their holidays.

Future continuous: will / shall + be + ing form

• She will be enjoying her holidays.
• I will be doing my project.

Future perfect: will / shall + have + past participle

• They will have returned from their holidays.
• She will have learnt her lesson.

Change tense as directed.

1. She will come in the afternoon. (Change into simple past)

2. I will not permit this. (Change into simple past)

3. She lives in the US. (Change into present continuous)

4. I have known them for a long time. (Change into past perfect)

5. What are you doing in my room? (Change into past continuous)

6. She didn’t recognize him. (Change into present perfect)

7. She ran a restaurant in town. (Change into simple present)

8. They are having lunch now. (Change into future continuous)

9. He was waiting for an opportunity. (Change into present perfect continuous)

10. They had finished the job. (Change into future perfect)

Answers

1. She came in the afternoon. (simple past)

2. I did not permit this. (simple past)

3. She is living in the US. (present continuous)

4. I had known them for a long time. (past perfect)

5. What were you doing in my room? (past continuous)

6. She hasn’t recognized him. (present perfect)

7. She runs a restaurant in town. (simple present)

8. They will be having lunch now. (future continuous)

9. He has been waiting for an opportunity. (present perfect continuous)

10. They will have finished the job. (future perfect)