否定句，My school trip wasn't great .
一般疑问句， Was your school trip great ?
肯定回答：Yes, it was .
否定回答： No, it wasn't.
分析：
陈述句变否定句和疑问句的方法：
1 句中有动词be （am , is ,are ,was ,were),情态动词，助动词时变否定句直接在这些词的后面加not 。变一般疑问句时直接把这些词提到句子前面即可，回答时一般是什么词开头，就用什么词的否定式。如
1) He is a student .
否定句： He isn't a student .
一般疑问句： Is he a student ?
肯定回答： Yes, he is .
否定回答： No, he isn't.
2) She can sing .
否定句：She can't sing .
一般疑问句： Can she sing ?
肯定回答： Yes, she can.
否定回答： No, she can't.
2. 实义动词作谓语，变否定句时要加助动词 don't / doesn't (一般现在时）/ didn't ( 一般过去时），原来的动词要还原； 变一般疑问句时在句子前面加 Do / Does (一般现在时）/ Did ( 一般过去时），原来的动词也要还原，如
1) They go to school on foot every day .
否定句：They don't go to school on foot every day .
一般疑问句： Do they go to school on foot every day ?
肯定回答：Yes, they do.
否定回答：No, they don't.
2) He often plays football after school .
否定句：He doesn't often play football after school .
一般疑问句：Does he often play football after school ?
肯定回答：Yes, he does .
否定回答：No, he doesn't.
3) She went to the park last Sunday .
否定句：She didn't go to the park last Sunday .
一般疑问句：Did she go to the park last Sunday ?
肯定回答：Yes, she did.
否定回答：No, she didn't.
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