Điền can - cant-coud -coudnt-didnt need to-must -mustnt-neednt
1) He ....play chess when he was young
2) You ... drive a car when you are 18
3) Jack spends the whole day just walking around. He ... have a job
4) When I was in school I... do a hand stand , but now Iam too old .I .. do one any more
5) My mother keeps telling me what we .. wash our hands before we sit down at the dinner table
6 you ... forget to turn off the lights when you go to bed
7 when i was a child i ... understand adults ,now that Iam an adult I ...i underderstand children
