Dựa vào các từ đã cho, hãy viết các câu hoàn chỉnh: Lan/ must/ finish/ all/ homework/ tonight; You must not/ walk/ grass/ park; We/ must/ follow/ all/ signs/ swimming pool

1. Lan/ must/ finish/ all/ homework/ tonight
2. You must not/ walk/ grass/ park
3. We/ must/ follow/ all/ signs/ swimming pool
4. She/ ought to/ help/ mother/ housework
5. Ba/ can/ swim/ across/ river
6. Small children/ can/ learn/ swim/ quickly/ easily
7. We/ ought to/ clean/ classroom
8. You/ should/ exercise/ regularly/ keep/ fit/ healthy
9. They/ should/ take part/ sports activities
10. you/ must not/ stay up/ every night