I want to know the correct usage of "very,too and much" .
where to use them grammatically?
com/definition/much If you want to know about 'very much' and 'too much', those definitions should help. Basically, 'very much' is 'to a great degree'; 'too much' is 'to an excessive degree'. CJ
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If you want definitions and examples of those three words, see these dictionary entries:
https://en.oxforddictionaries.com/definition/very
https://en.oxforddictionaries.com/definition/too