about the verb in the first sentence
sometimes use verb“ing",sometimes use "to verd",or just verb ,verb done ,could u tell me how to use the different forms of verbs

Question

Answer

This site gives very clear explanations with examples of the various verb tenses:
http://www.perfect-english-grammar.com/verb-tenses.html

Answer

You must first understand that verb+ing or to+verb are not a Main Verbs, they usually depend on other words in a sentence

Answer

Let me ask you a question .
Do you know the English grammars ?

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