though与although的区别：两个词都表示虽然,均不可以与but同时使用,但在句中可加still或yet连用。 although尽管、虽然仅作连词,比较正式,一般可以换为though; though虽然、尽管、即使,①还可以与even连用,表示即使、纵然,②作副词时意思是然而、不过,不能放在句首。③although不能放在句末，though则可以，用，隔开。如：He passed the exams although illness prevented him from going to classes./ she wont leave the TV set,even though her husband is waiting for her for the supper./ It was a quiet party. I had a good time, though.
prefer torather than与preferto的区别：prefer torather than后面都是用动词原形,preferto都是用动名词或名词。如：I prefer English to Japanese./ I prefer to learn English rather than learn Japanese.