My uncle went to Canada last night.
否定句 My uncle didn't go to Canada last night.
一般疑問句：Did your uncle go to Canada last night?
肯定回答：Yes,he did.
否定回答：No,he didn't.
I saw a TV show yesterday evening.
否定句：I didn't see a TV show yesterday.
一般疑問句：Did you see a TV show yesterday?
肯定回答：Yes,I did.
否定回答：No,I didn't.
Tim wrote aletter to his parents last night.
否定句：Tim didn't write a letter to his parents last night.
一般疑問句：Did Tim write a letter to his parents last night?
肯定句：Yes,he did.
否定句：No,he didn't.
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