[文法] 虛主詞

[lovebamboo (愛竹子)]

如果要把 Playing on the street and swimming in the river are dangerous.

改成虛主詞開頭是要用It is dangerous to play on the street and to swim ....

還是用They are dangerous......

好像沒看過they are這種用法，但主詞是複數還是改寫成it嗎?

(這問題好像有點笨，但有人問我我回答不出來="=)

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