被动语态的结构是 be+done 为什么被动语态后面还要加by 谁会告诉我下

2026年09月25日 17:55
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网友(1):

by
意思是[被],
后接
[人名],[名词]
或[代名词]
表示由谁做的.
John
wrote
this
book.
=>
This
book
was
written
by
John.
John needs
to
do
the
washing.
=>
The
washing needs
to
be
done
by
John.