1..I have(already) finished my homework.but I haven't done i

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1..I have(already) finished my homework.but I haven't done it（yet).这两个位置不可以换吗?
2...Which of the twin sisters is a doctor?
...( B )are.为什么选第二个啊?
A .All B.Both C.Either D.Neither

1、already用于肯定句,yet用于否定句,所以不可以互换.
2、all 和 both都有“都”的意思,谓语都用复数,但all用于三者或三者以上,both用于两者.根据题干,两个双胞胎姐妹都是医生,所以选B.
either 用于两者中的一个,谓语用单数,
neither指“两个没有一个,两个都不”,谓语也用单数,如：
Neither of them is teacher.

1..I have(already) finished my homework.but I haven't done i I haven't finishedall my homework,but i have-----finished it I haven’t finished my homework today. ---I have finished my homework already, mum. I haven't finished my homework yet._____. I have already finished my homework(改为否定句） I have already done my homework.改为一般疑问句 I've finished my homework already I have finished my homework I have already finished my homework.(变否定句) I _____ finished I haven't done that have I? My sister hasn't finished her homework,I haven't finished mi