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Leia o texto a seguir para responder à questão:
A language function is a purpose you wish to achieve when you say or write something. If you say ‘I invite you’, you are performing the function of inviting. Of course you could also say ‘D’you want to come to the cinema?’ to make an invitation. There are many ways of inviting, apologising, agreeing, giving advice, asking for information etc.
If our students want to express themselves in speaking or writing, they need to know to perform these functions – in other words, how to use grammar and vocabulary to express certain meanings/ purposes.
(Jeremy Harmer. How to teach English, 1998. Adaptado)