1.by bus
take a/an + 交通工具 + to sp = go to sp by + 交通工具
2.What does,do
第一个does为助动词,因为主语he是第三人称单数；
第二个do,和what一起构成do what“做什么”,表示对watches TV的提问.
3.smarter than
be + 形容词比较级 + than “比...更...”
4.What's,job
what does sb do?= what is one's job?= What be sb?“某人是做什么工作的?”