lab without a teacher. We are not allowed to enter the chemistry lab
without a teacher.
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2. 一般过去时: They agreed on the building of a new car
factory last month. The building of a new car factory was
tickets had already been sold out. The whole country was very sad at the
news of his death; People had considered him to be a great leader.
He had been considered to be a great leader.
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• (2)英语中被动语态由“助动词be +动词的过去分词”构成。助动词be 有时态、人称和数的变化。被动语态后的by短语有时可省去。具体结构 见下表:
现在时态 一般现在时 现在进行时
一般将来时
现在完成 时
am
am
will + be+p.p.
have(has)
谓语动词 is +p.p. is
• 相似动词see, watch, hear, notice, listen to, look at, make, feel,have,let
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• ③“动词+…+介词”改为被动时,介词一般在原位不动。如:The girl takes good care of her little brother.→ The girl’s little brother is taken good care of by her.