如题所述
一些动词和感观动词用于主动没有to，但变主动时需要加上to
例如：
I often see him help his mother in the garden.
改成被动语态就是：
He is often seen to help his mother in the garden.
这些动词有：see, let, hear, listen to等等。
例如：
I often see him help his mother in the garden.
改成被动语态就是：
He is often seen to help his mother in the garden.
这些动词有：see, let, hear, listen to等等。
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