几道英语句型转换,1.I don't konw when Ishuold leave.=I don't konw ___

几道英语句型转换,
1.I don't konw when Ishuold leave.=I don't konw ____ ____ ____ .
2.Amy is prettier than Kate.=Kate ____ ____ ____ ____ ____.
3.We must learn Engliash well.=It's ____ ____ ____ ____ ____Engliash well.
4.Tom is the tallset student in his class.=Tom is ____ ____ ____ ____students in our class.=Tom is ____ than ____ ____ student in uor class.
(注：每条横线代表一个单词）
2题最后面还有个Amy。