The pencil is either yours or mine.
Personal computers are getting as popular as TV sets.
He's very friendly to us, and what's more, he studies very well.
Who does the scarf belong to?
didn't, finished
travels
were
A what正是该句子的主语,却是个疑问词而已.
帮个忙.翻译句子这支铅笔不是你的就是我的（either...or...）个人电脑正变得像电视机一样普遍（as...as）