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where can use "is, am, are, has, have, had, was, were, would, should and want"

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5

The way in which italki limits the length of answers it would not be possible to answer all those individual questions at once in one comment. Also italki may suspect that if anyone tried by breaking the answer into more than one comment, the system may think the answerer was a spammer. 

You can search each word or phrase on google to get dictionary definitions and then ask other questions for any points you do not understand.

2
A beginning grammar book will cover this.  Basic Grammar in Use by Raymond Murphy is an excellent grammar book. 
1
It's true there is no match for Grammar In Use by Murphy. It consists of Essential, Intermediate and Advanced. I have learned a lot from them.
0
I'm really sorry 

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