by taxi和take a taxi的区别

take a taxi， 动宾结构，可以构成一个谓语了，比如 You can take a taxi.

by taxi，只能做状语， 不能说 You can by taxi, 前面必须有主谓结构，You can come by taxi.

How much is it to get the city by taxi?

坐出租车到市里要多少钱？

He usually used to go to work by taxi.

他过去经常剩出租车上班。

I think the sensible thing would be to take a taxi home.

我想还是坐出租车回去的好。

I was forced to take a taxi because the last bus had left.

最后一班公共汽车已经开走，所以我只好坐了一辆出租汽车。