1. Nowadays more and more students like to choose online courses and study by themselves.
by oneself 靠某人自己
2. You don't need to teach me how to cook. I can teach myself.
teach oneself 自学
learn by oneself
3. Welcome to my house, boys .Please help yourselves to some apples. 请自便吃苹果
help onesrlf to...
enjoy oneself
4.Mike and John are going to have a swimming lesson tomorrow.
6. Ruby, can you help do the dishes?
＿Just a minute ,Mum. I am watering the flowers . 等一会儿，我在浇花
情态动词+动词原形
7.He must do his homework before watching Tv.
8. Can you play table tennis?
＿No. But I can swim well.
must 必须（用于规章制度）
may 表示请求、许可；表推测
can 表能力；请求
few a few
little a little
判可数
判有无
