4.2 Statements, questions, orders, and suggestions
Sentences can be used to do many different things.
The most common use is to give information.
Sometimes you use a sentence to obtain information, rather than to give it.
At other times you want to express an opinion, give an order, make a suggestion, or make a promise.
When someone says or writes a sentence, they need to indicate what they are trying to do with it, so that it will be clear, for example, that they are asking a question and not making a statement.