Difference between should and would

[Duda]

Test No. incompl/elem-20 "Where am I?", question 2

I certainly will if I ..........

(a) could
(b) can
(c) can't
(d) should

Test No. incompl/elem-20 "Where am I?", answer 2

I certainly will if I can.

Correct answer: (b) can
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Hi, Please can you tell me the difference between shoud and would.
Many thanks

[Torsten]

Well,

Let's start with something both words have in common: They are both modal verbs. Should is used to express a duty or obligation while would can be used in a question, a request or to express a desire.
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