请问：1.when do you want to leave?和when were you thinking of le

请问：1.when do you want to leave?和when were you thinking of leaving?有什么区别还有2.i hope you can give me a window seat和i was hoping you could give me a window seat.3.do you want a direct flight?和were you looking for a direct flight?这些句子怎么区别,有什么语法,怎么理解.