三、句型转换
1. They were watching a talk show at 7：00 last night.（就画线部分提问）
they watching a talk show?
2. OurHours（全时便利店）had to shut down lots of their stores in Beijing to save costs.（改为一般疑问句）
OurHours to shut down lots of their stores in Beijing to save costs?
3. Linda helps her mum with housework every day.（用 at 10 o'clock yesterday morning 替换时间状语，改写句子）
Linda her mum with housework at 10 o'clock yesterday morning.
4. The boy spent half an hour finishing his homework yesterday.（改为同义句）
It the boy half an hour finish his homework yesterday.
5. I help to take care of my grandmother on Sundays.（改为同义句）
I help to my grandmother on Sundays.

1. When were 2. Did have 3. was helping 4. took to 5. look after

【分析】
1. 画线部分是时间状语，对时间提问用疑问词When；原句为过去进行时，变疑问句需将be动词were提前，主语是they，故填When were。
2. 原句是一般过去时，谓语为实义动词have的过去式had，变一般疑问句需借助助动词Did，置于句首，后面动词还原为原形have，故填Did have。
3. 替换后的时间状语表示过去具体时刻，需用过去进行时（结构：was/were + 现在分词）；主语Linda是单数，be动词用was，help的现在分词是helping，故填was helping。
4. “sb spend + 时间 + doing sth”的同义结构为“It takes sb + 时间 + to do sth”；原句为过去时，take变过去式took，后接不定式to，故填took to。
5. “take care of”（照顾）的同义短语是“look after”，故填look after。
【解析】
1. 对时间状语提问用When，原句是过去进行时，疑问句将be动词were提前，答案为When were。
2. 一般过去时实义动词作谓语的句子改一般疑问句，用助动词Did，后接动词原形have，答案为Did have。
3. 过去具体时刻作时间状语时，句子用过去进行时，主语Linda对应was，help的现在分词是helping，答案为was helping。
4. 同义句转换：spend结构转换为It takes sb...to do结构，原句过去式，take变took，后接to，答案为took to。
5. “take care of”的同义短语是“look after”，答案为look after。
【答案】
1. When were 2. Did have 3. was helping 4. took to 5. look after
【知识点】
过去进行时、一般疑问句转换、同义短语替换
【点评】
本题考查初中英语基础句型转换，涉及时态变化、疑问句构成、同义表达等核心知识点，是英语学习中需熟练掌握的基础题型，难度适中。
【难度系数】
0.3