改为被动语态,顺便讲讲,thank you.He didn't buy anything there before he started .Did the workers put up a lot of biuildings last year?What did he do with my watch?Whose ruler did youborrow?we must lie the young tree to the stick?Where can i put it down?May i look after the baby at home?

Nothing was bought before he started。
anything不与否定词连用，表示否定时用nothing。
Were a lot of buildings put up last year?
What was my watch done with?
Whose ruler was borrowed (by you )?
The young tree must be tied to the stick (by us) .
Where can it be put down (by you )?
May the baby be looked after by me at home ?
主动语态改为被动语态的方法：
一、将动作的承受者变成主语；二、谓语动词改成“be+过去分词”的形式；三、动作的执行者可写可不写，有时不写还更好；四、被动语态也有各种时态变化，这些变化都由be动词来完成；五、被动语态的疑问句是将be提前，否定句是在be后面加not（有些否定句不是用not来表示，而是用nothing, never, little等否定意义的词来表示）。

Nothing was bought before he started

He didn't buy anything there before he started .Anything was bought there before he started .Did the workers put up a lot of biuildings last year?Were a lot of buildings put up by the workers last yea...