句型转换。
1. The dress cost so much that she didn’t buy it.（用too … to …改写）
The dress cost 1. The dress cost too much for her to buy. 2. Because it rained yesterday, I stayed at home. 3. How soon will your parents go to America? her 4. Thermoses are used for keeping water warm. buy.
2. It rained yesterday, so I stayed at home.（用because改写）
5. How often do you meet him after he moved to another district? it 6. The small boy is interested in collecting coins. yesterday, I 7. A Canadian doctor invented basketball. at home.
3. My parents will go to America in two weeks.（对划线部分提问）
8. Naismith thought he could do it well. 9. He separated the players into two teams of eleven. 10. He could not know anyone at the party. your parents to America.
4. People use thermoses (热水瓶)for keeping water warm.（改为被动语态）
Thermoses water warm。
5. I hardly ever meet him after he moved to another district.（对划线部分提问）
you meet him after he moved to another district?
6. Collecting coins interests the small boy.（用interested改写）
The small boy coins.
7. Basketball was invented by a Canadian doctor.（改为主动语态）
a Canadian doctor .
8. Naismith thinks he can do it well.（改为过去时）
Naismith he do it well.
9. He divided the players into two teams of eleven.（改为同义句）
He the players into two teams of eleven.
10. He might know anyone at the party.（改为表示否定推测的句子）
He know anyone at the party.
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解析：
1.考查固定句型。so...that...“如此......以至于......”；too... to...“太......而不能......”，to前可加上for sb.“对某人来说”。故原句可转换为The dress cost too much for her to buy.。
2.because和so都可表示因果，但不能连用。because加原因，so加结果。故改写为Because it rained yesterday, I stayed at home.。
3.In加时间段表示将来，意为“多久之后”，故用how soon提问。故改写为How soon will your parents go to America?。
4.“被用来做某事”意为sth. Be used to do sth./for doing sth.故改写为Thermoses are used for keeping/to keep water warm.。
5.hardly“几乎不”，表示否定，故hardly ever相当于never。对频率提问用how often，原句时态用的是一般现在时。故特殊疑问句借助于助动词do。
6.“对......感兴趣”be interested in sth.，时态是一般现在时。故改写为The small boy is interested in collecting coins.
7.主动语态就是句子的主语是动作的发出者，而被动语态正好相反，主语是动作的承受者。时态是一般过去时。故原句改写为A Canadian doctor invented basketball.。
8.think的过去式是thought，can的过去式是could。故改写为Naismith thought he could do it well.。
9.Separate... Into ...“把......分成......”。故改写为He separated the players into two teams of eleven.。
10.情态动词可以表推测，can’t“不可能”；may not“可能不”。故原句改写为He could not/might not know anyone at the party.