the use of the word should

I don't quite understand when and how to use 'should' as the start of a sentence, for example 'should you have any comments please feel free to contact me'

[Tdol]

'Should' there replaces 'if'. We often do this replacemnt in first conditionals. It can be used to reduce the probability- should you need help = you probably won't. It's also common in formal language.

[Steven D]

Originally Posted by tdol

'Should' there replaces 'if'. We often do this replacemnt in first conditionals. It can be used to reduce the probability- should you need help = you probably won't. It's also common in formal language.

"I should like to know," said the butler.