English Grammar : Use of Modals

Learn Grammar | English Grammar : Use of Modals " Could" | Modal auxiliary could used for :

1. Demonstrated ability in the past (past).

• He could swim very fast when he was a child
• She could sing beautifully ten years ago.

English Grammar : Use of Modals " May and Might "

Learn Grammar | English Grammar : Use of Modals " May and Might " | 1. Modal auxiliary may used for :
a. Asking permission (permissions)
May I borrow your book?
May I use your pen ?
Certainly you may

b. Stating the possibility (possibility to present)
The thief may be in the warehouse
They may be at the canteen.