dựa vào các từ đã cho,hãy viết các câu hoàn chỉnh
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/learn/classroom
8. you/should/exercises/regularly/keep/fit/healthy
9.they/should/take part/sports activities
10.you/must not/stay up/every night
giup mik với mik đag cần rất gấp vào chiều nay