A1 Rewrite the sentences below using the words in brackets.
1 He was absent from school yesterday because he was ill. (because of)

2 She began to learn French when she was 12 years old. (at the age of)

3 Suzy will not succeed without her classmates' help. (if ... not)

4 Carl went to Russia with his parents at the age of eight. (when)

5 Kitty did not play tennis with her friends last Sunday because of the heavy rain. (because)

6 If you do not have a space helmet, you cannot protect your head when travelling in space. (without)

1. He was absent from school yesterday because of his illness.
2. She began to learn French at the age of 12.
3. Suzy will not succeed if she doesn't have her classmates' help.
4. Carl went to Russia with his parents when he was eight.
5. Kitty did not play tennis with her friends last Sunday because it rained heavily.
6. Without a space helmet, you cannot protect your head when travelling in space.

1. because后接从句，because of后接名词/名词短语，需将原句中的从句"he was ill"转换为名词短语"his illness"来改写。
2. when引导时间状语从句，at the age of后接具体年龄数字，需将原句中的时间从句"when she was 12 years old"替换为"at the age of 12"。
3. without表示“没有”，可转换为if引导的否定条件状语从句，需将"without her classmates' help"改为"if she doesn't have her classmates' help"。
4. at the age of后接数字表年龄，可转换为when引导的时间状语从句，需将"at the age of eight"改为"when he was eight"。
5. because of后接名词/名词短语，because后接从句，需将原句中的名词短语"the heavy rain"转换为从句"it rained heavily"来改写。
6. if引导的否定条件状语从句可转换为without加名词短语的结构，需将"If you do not have a space helmet"改为"Without a space helmet"。

A2 Rewrite the sentences below using simple sentences with prepositional phrases.
1 Miss Li did not buy the blouse because its price was high.

2 His grandmother passed away when she was 99 years old.

3 This dish will not be tasty if there is no salt.

4 She went to study in Nanjing when she was 18.

5 Samuel walked very slowly because his right leg had been wounded.

6 We cannot learn about the world well if there is no Internet.

1. Miss Li did not buy the blouse because of its high price.
2. His grandmother passed away at the age of 99.
3. This dish will not be tasty without salt.
4. She went to study in Nanjing at the age of 18.
5. Samuel walked very slowly because of his wounded right leg.
6. We cannot learn about the world well without the Internet.

本题要求将含有状语从句的复合句改写为带有介词短语的简单句，需根据原句逻辑选择合适的介词（短语），如表原因用because of，表时间用at the age of，表条件用without等，将从句内容转化为名词性结构置于介词后。