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一、指代物 it可替代动植物与无生命的东西，它与one的区别在于one= a/an + none; it = the + n。 1. ---Where is my pencil case? ---Isnt it in your backpack? 2. ---I have a motorbike. It (= the motorbike) was bought three years ago. 3. As this chair is broken, I must have it (= the chair)repaired. 4. My father bought a pen and gave it (= the pen) to me. 5. You can not eat your cake and have it. 世事难两全。 试比较： 6. I have no dictionary, so I want to buy one. (one = a dictionary) 7. I have a dictionary, it is over there. (it = the dictionary) 二、指代人 it可指代一个未亲眼看到的、不明身份性别的、面目不详的人，或婴儿、儿童，照片中的人物等。 8. --- Who is there waving to you? ---Its my friend Tom. 9. ---Who is crying in the room? ---Its my brother Jack. 10. ---Who is knocking at the door? ---It must be Kate, my classmate. 11. ---Who is the girl in the photo on the wall? ---Its my sister. 12. ---Who is it? ---Its me. (有人敲门) 13. ---Someone is ringing the doorbell. Go and see who it is. (敲门) 14. ---Oh, by the way, there is a telephone call for you. ---Who was it? (打电话) | 
