They 're doing you this big favour by allowing you to stay .
他们允许你留下来,是给了你的一个极大的恩惠。
Dan ... Erm , I 've got a big favour to ask
丹我想请你帮个忙
I feel bit unesay about asking her to do me such a big favour .
请她帮这么大的忙,我感到有点过意不去。