Hi Magda Were to and should are indeed interchangeable; were to may sound a little more stilted. They are used in if-clauses: If he were to call / should call, tell him I'll be back soon. This is very close in meaning to If he called, tell him I'll be back soon.
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Tung QuocHi,Yes, happened to call is just
Do you think in your examples above, should = were to = happended to ?
(If he were to call / should call, tell him I'll be back soon. (1)
=If he happened to call, tell him I'll be back soon. (2) ?)
If not, what is the difference betwwen them?
Q
Do you use "were to" as described above?