4.35 'let'

'Let' is used in imperative sentences in four different ways:

* it is used to give an order or instruction

* you use it followed by 'us' when you are making a suggestion about what you and someone else should do. 'Let us' is almost always shortened to 'Let's'

* you use it followed my 'me' when you are offering to do something

* in very formal English, it is used to express a wish.