第一句：I am wrighting my homework at nine last night!
第二句：They were readig when I coming into the classroom!
第三句：I had had breakfast before 7 :00 this morning.
I was doing my exercise at nine yesterday.
they are reading when I come into classroom.
I had had breakfast before seven o'clock this morning.
1.I was doing my homework at nine o'clock yesterday evening.
2.They were reading when I got to the classroom.
3.I had had breakfast before seven o'clock this morning.
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