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This area provides you with concise explanation of many tricky grammatical structures.

The 'zero' article : : Indefinite articles : : Definite articles : : Questions with like : : Question tags : : Time prepositions : : Reported Speech : : Simple passive : : Continuous passive : : Because and because of : : To, for, so that : : '-ed' and '-ing' adjectives : : Need + verb-ing : : Have something done : : Must : : Have to / don't have to : : Used to : : Wish + Past Perfect : :


A question tag is a short question at the end of a sentence, which we use to find out information or check information that we already have. This is how you form question tags:

Positive sentence - negative tag You will do it quickly, won't you?
Negative sentence - positive tag She isn't happy, is she?
Main verb - use 'do' We went to the party, didn't we?
Pronouns Yuki and Tomo are Japanese, aren't they?

Question tags are often used in spoken English. A rising intonation is used to show that the question is real, whereas a falling intonation shows that the speaker just wants confirmation from the person being spoken to.

 
Question Tags are formed in this way:
 
It is raining, isn't it? This is a negative tag
(The tag is the part after the comma, ‘isn’t it’ )
 
It is not raining, is it? This is a positive tag.
 
The most important thing to remember is that the auxiliary verb in the statement 'It is raining,..' must be changed to it's opposite form for the tag 'isnt, it?'
 
Here are a few examples of the opposite forms of auxillary verbs:
 
will→ won't                         should →shouldn't
do →don't                           have →haven't
does →doesn't                 can→ can't                          
am→ aren't
are→ aren't
must →musn't
 
Examples of positive tags
 
Your father doesn't work in a bank, does he?
They aren't from Spain, are they?
Penguins can't fly, can they?
 
Examples of negative tags
 
His name is Mike, isn't it?
You have finished, haven't you?
He will come, won't he?
 

Now add the missing tags to these questions 



Очистка водоемов , прудов, системы, фильтр для очистки воды водоёмов, прудов. Очистка дна водоема.