Modal verbs, semi-modal verbs (also called marginal modals) and other modal expressions are listed in alphabetical order in the table below. For a detailed discussion of each modal see the previous chapters.
Should in that-clauses is used as an alternative to present or past tenses to express surprise or disbelief:
I'm sorry that he should feel that way.
It's funny that we should be living in the same block of flats.
It's surprising that she should have said that.
Would + infinitive can refer to unreal situations in the present or future. An unreal situation is one which is not true in the present or one which may or may not happen in the future:
