1) I can draw a face. He can help you.
2) I am able to see her. He is able to eat 4 dishes at a time.
3) It may rain tonight. He may be at home.
4) You must brush your teeth every day. I must learn this.
5) I have to call him now. I have to do this excercise.
6) I would recommend this film. He would phone me.
7) You should drink more water. It should be fine weather tomorrow.