Answer the following questions:

1) What is tenses?

2) What is simple present tense?

3) What are the basics structure sentence of simple present

4) What is present progressive tense?

5) What are the basics structure sentence of present progressive?

6) What is simple past tense?

7) What are the basics structure sentence of simple past?

8) What is past progressive tense?

9) What are the basics structure sentence of past progressive