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什么是疑问句？
疑问句是用来询问答案或信息的句子。在书写中，疑问句通常以问号结尾。
疑问句的类型
英语中有两种主要的疑问句类型：
'Yes'/'No'疑问句
Wh-疑问句
'Yes'/'No'疑问句
'Yes'/'No'疑问句是那些答案为'是'或'否'的句子。
'Yes'/'No'疑问句的构成
当句子中有'be'、'do'或'have'作为助动词时，是/否疑问句的构成如下：
'Be'/'Have'/'Do' + 主语 + 主动词
Are you leaving?
你要走了吗？
Has he called?
他打电话了吗？
Does it look okay?
它看起来还好吗？
如果句子中有情态动词，是/否疑问句的构成如下：
情态动词 + 主语 + 主动词
Can you swim?
你会游泳吗？
Should I go?
我应该走吗？
如果句子中没有助动词或情态动词，需添加助动词'do'、'does'或'did'来构成疑问句：
Do you usually exercise?
你通常锻炼吗？
Did you forget your keys?
你忘了带钥匙吗？
如果句子的主动词是'be'，主语和动词'to be'交换位置，构成疑问句，不需要助动词。例如：
Her name is Sarah. → Is her name Sarah?
她的名字是萨拉。→ 她的名字是萨拉吗？
He is your brother. → Is he your brother?
他是你哥哥。→ 他是你哥哥吗？
Wh-疑问句
'Wh-疑问句'是用'wh-'开头的词，如'what'、'when'、'where'、'who'等，这类疑问句用于询问信息，不能用'yes'或'no'来回答。
如何构成Wh-疑问句
如果句子中有助动词（'be'、'do'或'have'）或情态动词，Wh-疑问句的构成如下：
Wh-词 + 'be'/'do'/'have' + 主语 + 主动词
或
Wh-词 + 情态动词 + 主语 + 主动词
Where do you live?
你住在哪里？
What can I do for you?
我能为你做什么？
如果句子中没有助动词，并且'what'、'who'、'which'或'whose'是句子的主语，则无需使用助动词。主语在动词前形成疑问句。
Who called last night?
昨晚是谁打的电话？
What dropped from the tree?
从树上掉下来的是什么？
Quiz:
Which sentence is a correct Yes/No question?
Where do you like pizza?
Do you like pizza?
What pizza do you like?
Who likes pizza?
What is the correct structure for a Yes/No question for the sentence "You can swim"?
Can you swim?
Can swim you?
You can swim?
Swim can you?
Sort the words to form a Wh- question.
Match each sentence with the correct type of question.
Fill in the blank with the correct auxiliary, modal, or wh- word.
you like ice cream?
is your favorite color?
did you call last night?
she like to read books?
he finish his homework before going to bed?
you going to school?
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