这是最简单的
The best way to Shanghai is by air.
这样也可以
It is better to go to Shanghai by plane.
以下的文法不对,
You'd better go to., 应该是 you would be better off, if you go to Shanghai by air.
You had better go to. 是, 你如果坐飞机去上海就好了.
had better 得意思是,你没有做,但如果做了,就更好.
最好乘飞机去上海 英语