Английский язык. Система упражнений для формирования грамматической компетенции студентов: ситуативный контекст. Тимофеева Т.И. - 43 стр.

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UNIT 7. TAG QUESTIONS
Tag question forms
We can put a tag at the end of a statement to make a question. We use the verb in the
statement to make the tag, using an auxiliary if necessary. The noun in the statement
becomes a pronoun in the tag.
In the most common types of tag question, a positive verb has a negative tag.
You like pizza, don't you? (I'm not sure)
A negative verb has a positive tag.
Andrew won't be angry, will he? (I want you to tell me that he won't)
Types of tag questions
positive verb, negative tag
When we use a positive verb and a negative tag, we generally expect a yes answer.
Russia produces a lot of natural gas, doesn't it? Yes, it does.
A lot of diamonds come from South Africa, don't they? Yes, they do.
negative verb, positive tag
When we use a negative verb and a positive tag, we generally expect a no answer.
There aren't any active volcanoes in Scotland, are there? No, there aren't.
Switzerland doesn't belong to the EU, does it? No, it doesn't.
Intonation and meaning
The meaning of the question depends on the intonation we use. When the intonation
falls or is level, we are checking information we already know.
There are mountains in New Zealand, aren't there? Yes, that's right.
When the intonation rises, we are asking a question. That's not the Greek flag, is it?
No, you're right. The Greek flag is blue and white.