6A
1.动词如果在No后表示禁止做某事，动词要用ing形式，如：No swimming;
如果前面是don’t或者do not后面跟动词原形，如：Do not touch.
2.must, would, should (shouldn’t), can，may的区别
must表示必须一定做到的事情;would表示想要做的事情，would like to do sth.
should(shouldn’t)表示应该或不应该;can表示能够，会做某事;may表示可以或允许做某事。
must, should shouldn't, can,may都是情态动词，后面都跟动词原形。
3.I’d like=I would like 我想要某物 === I want…
I’d like to = I would like to我想要做某事 == I want to…
would like 想要的意思。可用于表示邀请，后面如果加动词用would like to +动词原形
例 1.I’d like some balloons. →Would you like some balloons?
＝I want some balloons .→ Do you want some balloons ?
4. I’d like to watch TV . → Would you like to watch TV?
＝I want to watch TV . → Do you want to watch TV?
5.介词in. on at的用法
in表示：“段”时间，常用在年份，月份，季节前， 也用在上午，下午和晚上前。
例如：in 1997 在1997年 in spring在春季 in May在五月
in the moring在上午 in the afternoon 在下午 in the evening在晚上