“应该”的英文表达有：must、should、behove、ought to、be supposed to do
解析：
1、must
读音：英 [mʌst] 美 [mʌst]
aux. 必须；应当；很可能
n. 必须做的事；未发酵的葡萄汁；发霉
One must honor his contract and keep his word.
任何人都应当尊重合同，信守诺言。
2、should
英 [ʃəd] 美 [ʃəd]
aux. 应该；可能；应当；竟然；将要
Real friends should have everything in common.
真正的朋友应当共享一切。
3、behove
读音：英 [bɪ'həʊv] 美 [bɪ'hoʊv]
v. 理应；应该；有必要
=behoove(美).
It ill behoves Anne (ie She ought not) to speak thus of her benefactor.
安不应该这样谈论她的恩人。
4、ought to
读音：英 [ˈɔ:t tə] 美 [ɔt tu]
v.理应；应当，应该；宜
We ought to follow her good example.
她是个好榜样，我们应当仿效她。
5、be supposed to do
读音：英 [bi: səˈpəʊzd tu: du:] 美 [bi səˈpozd tu du]
应当，应该
I must write down each hour to be supposed to do any, perhaps I incompletely illuminate do, but must subscribe this plan.
我要写下每个小时该干什么，也许我不完全照做，但还是要订下这个计划。
短句：i should rather say no to the school bullying
You should speak english in english class
Maybe I should say sorry to her.
Must 必须，一定；很可能；可以，应当
短句: You must start the project from main idea.
I must go to the office
And now we must go, to the library.
如果你说的是应该的话，我更建议你用第一个should，第二个must无论在语气上或用途上更显的肯定一点，一定要怎样怎样。
You should do
should be supposed to
You ought to do
You had better do
英语上有任何问题，都可以找到洛基英语来帮忙解决！本回答被网友采纳