You'd better ___(not spend) too much time ___(chat) with your Net-pals.
Mr.Smith___ (prefer) coffee to tea five years ago.
Look!The doctor ___(examine) the students' teeth.
Why not ___(go) sightseeing in Shanghai in spring?
We should take the doctor' advice and have a balanced diet.(保持原句意思)
We ___ ___ take the the doctor' advice and have a balanced diet.
not spend chatting
preferred
is examining
go
had to
1 not spend (in) chatting
had better (not) do sth.表最好做/不做某事； spend +money/time (in) doing sth.表花费时间、金钱做某事。
2 preferred 结合句子的时态(five years ago)，过去时。
3 is examining 现在进行时，表正在发生的动作，“看，那医生正在检查学生的牙齿。”
4 go why not do sth== why don't you do sth 表示提议、建议“为什么不。。。。呢？”
5 ought to 应该
not spend ，chatting（记住had better do sth 或者had better not do sth ,spend some time in doing sth ）preferred，（five years ago是过去的时间用过去式，prefer的过去要双写r再加ed
is examining，（look表示正在进行，则用现在进行时be +doing
go（记住why not 后面加动词原形就是，不管动词是哪一个，原形就是对的）
ought to（意思和should相同，并且ought to do sth表示应该做某事
not spend chatting
preferred
is examining
go
ought to
not spend chatting
preferred
is examining
go
ought to
not spend chatting
preferred
is examining
go
had better
not spend chatting
preferred
is examining
go
had to
把我射为最佳答案把