【英语sitseat的区别1.whenallthestudentswereseatedhebeganhislecture.为什么wereseated不能改为sat?2.It'snoneofyourbusinesshowmuchIweigh"who'sthatgirlyouwerewith?"这句话是什么意思啊,然后howmuchiweigh"】

　　英语sitseat的区别

　　1.whenallthestudentswereseatedhebeganhislecture.为什么wereseated不能改为sat?

　　2.It'snoneofyourbusinesshowmuchIweigh"who'sthatgirlyouwerewith?"这句话是什么意思啊,然后howmuchiweigh"who'sthatgirlyouwerewith?"这句话怎么理解啊?然后这是什么句子?语法是什么啊?

　　It'snoneofyourbusinesshowmuchiweigh这是一个句子，

　　who'sthatgirlyouwerewith?

　　这又是一个句子，我把这两个句子写成一句话了