They'll take Tom up on that generous invitation.(original) Question: How to write a new sentence with its subject (being?) the "Tom"? and its subject being the "that generous invitation"? I guess : 1.Tom will be taken up (by them?) on that generous invitation. (I don't know where the the position of the "by them" is in this sentence) Is this sentence grammatically correct? 2. That generous invitation will be taken (by them?) Tom up on. Is this sentence grammatically correct? but somehow I think it is better to say: Tom's (that?) generous invitation will be taken up (or, will be accepted) ( by them?). Is my thought correct according to the original? Pay attention to all the ? in the "(…)", if finding incorrect , please help to correct.