请指出it在下列各句中的用法.
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请指出it在下列各句中的用法.
may i use your dictionary?sorry,i left it at home.
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it is a good idea to bring a camera when we travel around.
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it is polite knocking on the door begor entering a room.
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i found it difficult to protect the environment by oneself.
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it's said that MH370 has been discovered in the Indian Ocean.
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may i use your dictionary?sorry,i left it at home.
_________________________________________
it is a good idea to bring a camera when we travel around.
__________________________________________
it is polite knocking on the door begor entering a room.
__________________________________________
i found it difficult to protect the environment by oneself.
___________________________________________
it's said that MH370 has been discovered in the Indian Ocean.
____________________________________________
![请指出it在下列各句中的用法.](/uploads/image/z/638857-1-7.jpg?t=%E8%AF%B7%E6%8C%87%E5%87%BAit%E5%9C%A8%E4%B8%8B%E5%88%97%E5%90%84%E5%8F%A5%E4%B8%AD%E7%9A%84%E7%94%A8%E6%B3%95.)
1.代词,指代dictionary 2.形式主语 3.形式主语4.宾语5.形式主语(代词,指代后面的that从句)