the only long period of time during it the whole family coul

the only long period of time during it the whole family could be
together once a year is the Spring Festival.at that time we missed our parents badly ,but didn't say so because grandma always told us that work hard was everyone's duty and we should concentrate on ours.
1.为什么要把IT改成WHICH啊?
2.always 前应该+was吧?副词可以直接用吗?比如my parents were always busy.这句话就有BE
3.work 为什么要+ING?
4.AND后加THAT这是什么句式?感觉很怪!

1、the only long period of time during it the whole family could be together once a year is the Spring Festival.这句话的主语是the only long period of time
during which引导的是一个定语从句the whole family could be together once a year,which 是一个引导词
2、副词可以直接用.my parents were always busy
是一个系表结构,be是一个系动词
3、动词需要变成分词形式才能充当主语.
4、we should concentrate on ours.是tell的宾语从句,引导词用that,如果跟在tell之后可以省略,但前面有一个and为了避免歧义,that不能省略.

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