作业帮There used to be three telephones on the desk.(改为一般疑问句)
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There used to be three telephones on the desk.(改为一般疑问句)
Used there to be three telephones on the desk?
或者：
Did there use to be three telephones on the desk?
Did there use to be three telephones on the desk?
Did there use to be three telephones on the desk? or Used there to be telephones on the desk?
did there use to be three telephones on the desk?
Did there use to be three telephones on the desk?
含有used to的句子改写规则:
1. 否定句
used to的否定式通常为didn’t use to。如：
She didn’t use to have long hair.
2. 一般疑问句
含有used to的句子变为一般疑问句时, 可用“助...
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Did there use to be three telephones on the desk?
含有used to的句子改写规则:
1. 否定句
used to的否定式通常为didn’t use to。如：
She didn’t use to have long hair.
2. 一般疑问句
含有used to的句子变为一般疑问句时, 可用“助动词Did+主语+use to do sth. ?”结构。肯定回答用Yes, sb. did；否定回答用No, sb. didn’t。如：
—Did you use to play the piano? —Yes, I did. /No, I didn’t.
3. 特殊疑问句
含有used to的特殊疑问句的结构为“疑问词+助动词did+主语+use to do...?”。如：
—What did you use to do? —I used to collect stamps.
4. 反意疑问句
如果陈述部分含有used to, 附加疑问部分通常使用助动词did来引导。如：
The house used to be a shop, didn’t it?
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