(关于so/not用于代替从句
A Will it be expensive?
I should/would think so./I should think it would.I shouldnt think it would./I shouldnt/wouldnt think so./I should/would think not.
这个会很贵吗?
我想是的。/我想不。
回答这一类问题时，回答人暗示他并不确实知道，只是凭印象而言。 I should/would think 表示的语气没有I think那么肯定。
should/would think引导一个附加评论时，一般不能用so/ not。这时必须使用that从句：
Hes an astrologer， looking for work.
I shouldnt/wouldnt think that hed find it easy to get work.
他是一个星相家，正在找工作。
我想他大概不会感到找到一份工作是容易的。
B 如果评论发生在过去的动作，可以用should/would have thought：
He actually got a job as an astrologer.
I shouldnt/wouldnt have thought that it was possibe to do that.
他真的以星相家的身份找了一份工作。
我本来认为那是不可能的。
C should/would have expected+不定式结构/that从句也是可行的。有时非人称代词you可代替I：
She has emigrated.
Has she? Youd/Id have expected her to stay in this country.
她移居国外了。
是吗?人们/我还以为她会留在国内的。