15.16.17.18.19.20.

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15.16.17.18.19.20.15.16.17.18.19.20. 15.16.17.18.19.20.15.iswritingtonoisdoing16.whenwantto17.你

15.16.17.18.19.20.
15.16.17.18.19.20.
 

15.16.17.18.19.20.
15.is writing to
no is doing
16.when want to
17.你是对的.
18.what are they talking about? / they are talking about what?
19.bob is talking on the phone.
20.who is/are tom and jim talking to?
21.what are you doing?/you are doing what?
前个问句较正式,最好用前面的