1.This is my aunt.(She )is very nice and we all like( her)
第一个是主语,要用主格she,第二个是介词like的宾语,要用宾格her
2.Your are so busy.What do you want me (to do )for you.
want sb to do sth 意思是 想让某人做某事
3 *(Whose )card is this?---It's Amy's
这是对所属提问,所以要用whose：谁的
4*How many (tomatoes )do you want?--Two kilos,please.
从many及回答看,应该是一个既是可数名词,又能被称重的东西,所以用了tomatoes,当然同样的词还有很多,比如：oranges apples ...
5*Tom,you look great in your white T-shirt.
Thank you.