How to use 'should' to mean 'if'

In English, various words can be used to mean the same thing. For example, we can use 'if', 'in case', 'provided that' and 'should' to be mean the same thing.

In this post, I will show you how to use 'should' correctly to carry the meaning of 'if'.
Firstly, 'should' must be at the beginning of a sentence. Secondly the verb that follows it must be in the infinitive or present tense. Let us look at the following examples:
1 Should you change your mind, you can always cancel the trip.
(If you change your mind,you can always cancel the trip.)
2 Should the need arise, I will render help without fail.
(If there is a need, I will surely help.)