在主动句中,主语作为动作的执行者:masked
thieves
stole
a
valuable
painting
from
the
museum
last
naght.(昨天夜里蒙面窃贼从博物馆里盗走了一幅价值连城的油画。)
将这个句子变为被动句时,动词的宾语就成为主句:a
valuable
painting
was
stolen
from
the
museum
last
night.(昨天夜里博物馆里一幅价值连城的油画被盗了)
被动语态由助动词be+动词过去分词构成:museum
security
to
be
improved.(博物馆安全有待加强)