I have two sentences below:
1) As Jane and I are going to England by car, why do not you join us?
2) How about going to England with Jane and me since we are taking the car?
number one and number two are similar sentences. what I want to learn is, function of as nad since. especially I could not understand what these sentences mention about? what is the function of as nad since?
note: is it correct my sentences above grammatically?
Minor point: when making a suggestion with the "why don't you..." construction, we always contract "do" and "not" into "don't." Otherwise your sentences are correct, and mean the same thing: an invitation to accompany us to England. The implication is that since we are traveling by car (instead of by train, boat, airplane, etc.) there will be extra room in the car, so you can come along at no charge.