In this episode of the Flatmates Helens says to Khalid:
'Don't forget to make a wish!' Tim also says to Khalid: 'Don't say it out loud!' These are both examples of what are called imperatives and in particular, negative imperatives. The imperative is a verb form that is used to give orders, instructions, advice, encouragement etc. It's formed by using the base infinitive of the verb (the infinitive without to). You don't need a subject. Sit down! Be quiet! Go away! Put it down there. Try speaking more slowly. Take care! Be careful! You can make an imperative more emphatic (stronger) by adding 'do' before the verb. This can also show more politeness or more concern as well as being a strong order. Oh doshut up! (Strong order) Welcome, do sit down. (Formal / polite) It's a long journey, do take care. (showing concern) In all cases pronunciation is very important. The same words can show anger or politeness depending on the tone of voice.
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