Sunil yadav Posted 14 years ago
Grammar

what is use in con and could
  

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Hello, Sunil—and welcome to English Forums. Do you mean can and could ? htm

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Hello, Sunil—and welcome to English Forums.

Do you mean can and could? You can start by reading about these two auxiliary verbs at these links:

http://grammar.ccc.commnet.edu/grammar/auxiliary.htm