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It is important for her to do her homework.
What is he doing ?
He is eating hamburgers.
Is it healthy ?
It is unhealthy for him to eat hamburgers.
Practice
为啥记不住单词？
natural
forget
It is natural for her to forget new words.
compare
It is interesting for them to watch a movie.
It is important for her to do her homwork.
It is unhealthy for him to eat hamburgers.
It is + adj + for sb + to do sth
对于某人
practice
crowded
take a bus
It is crowded for them to take a bus.
What is he doing?
He is climbing the mountain.
Is he brave?
It is brave of him to climb the mountain.
Jenny is helping the old man.
Is Jenny very kind?
It is kind of Jenny to help the old man.
What happened to them ？
Are they careless?
Yes.