1、be obliged to do和feel obliged to do 意思一样，指 “不得不，只能，必须，有义务去做某件事。”
2、 但是在用的时候，有细微差别。就跟 have to / must 这对情况差不多。
3、 be obliged to do 更强调后面跟的具体事件；而feel obliged to do 则略带有主观色彩，侧重前面接的那个人的感受，那个人（ 比如I , you ）觉得有义务做某事，感到有必要做某事。
4、 be obliged to do 是基本短语，而feel obliged to do 是引申出来的，一个活用短语。
拓展资料
be obliged to do
1、When a person does a certain thing again and again, he'll be obliged to do it in the same way by some unseen force. Thus habit is formed.
当一个人反复的做某件事时，他就会被某种看不见的力量驱使不得不以同样的方式再去做这件事，于是习惯就形成了。
2、No witness at an inquest shall be obliged to answer a question if to do so would tend to incriminate him.
在研讯中，如证人回答某问题可能导致他入罪，则他不须回答该问题。
3、He also rejected the contention that a term should be implied into the charter that the charterer was obliged not to do anything deliberately which prevented the date of the first notice being met.
法官同时反对，租约有默示承租人有义务不能做任何违反第一次通知还船日期行为的效力。
feel obliged to do
1、With great regret, I might feel obliged to do the same.
届时我可能不得不采取同样的措施，这将是非常令人遗憾的。
2、In some jobs, it is difficult to get away on time ( if all your colleagues work late, you might feel obliged to do the same).
对于某些职业，要准时下班是件难事（如果你所有的同事都工作到很晚，你可能觉得也要这样做才行）。
3、If you feel like you "have to" do something you'll automatically feel a sense of restrainment and negativity, that comes naturally when we're feeling obliged to do something.
如果有什么事情是你感觉是“必须”要做的，那么你会不由自主的产生一种消极抵触的情绪，当你感到“被迫”要去做什么事情是自然会产生这种情绪。