"By the time we got on the train,somebody had taken the last seat"怎么改成被动语态?

问题描述:

"By the time we got on the train,somebody had taken the last seat"怎么改成被动语态?

by the time we got on the train ,the last seat had been taken by somebody

By the time we got on the train, the last seat had been taken.

By the time we got on the train,the last seat had been taken by somebody.

By the time we got on the train, the last seat had been taken by somebody.

By the time we got on the train,the last seat had been taken by somebody.
只要你能找出及物动词,被动语态就不难