英语语法疑惑

Question

1,Whose turn is that to clean the classroom?
这个that怎么改为什么？什么用法这是？
2，It is cruel for her to kill the wild animals to eat.
改for还是什么？ 为什么？

Answer 1

1. that改成it
固定句型：It‘s one's turn to do sth，意思是“轮到某人做某事了”。
对one's提问，即为该问句，其中it为形式主语，that是不能做句子的形式主语的。
如：It's my turn to clean the classroom. 轮到我打扫教室了。

2. for改成of
因为形容词cruel是指人的性格/品德方面，所以用：it’s + 形容词 + of sb to do sth.
如果形容词不指人的性格/品德方面，则用：it’s + 形容词 + for sb to do sth.
另：此种判断还可以用以下方法，即该句型可以不可以改成：sb be + 形容词 + to do sth.
如果可以，则用of；如果不可以，则用for.
如：It's kind of you to help me. = You are kind to help me.
再如：It's important for me to learn English，但是不可以说：I'm important to learn English.

参考资料：英语牛人团

Answer 2

1,Whose turn is that to clean the classroom?
倒回去应该是it is one's turn to do sth.所以这里的that要改成it
2，It is cruel for her to kill the wild animals to eat.
不知道你能不能改多个词，可以的话我会改成It is cruel for her to kill the wild animals for food.原因……我只能说因为原来那样很别扭。而且如果把for her 省掉的话，原句就变成It is cruel to kill the wild animals to eat.这样的话eat的主语就不明确了