时态
时态是用以表示各种时间和动作方面的动词形式。时间有四个主要部分，即现在、过去、将来和过去将来。动作方面也有四种，即一般、完成、进行和完成进行。将这些时间和动作方面组合在一起，即构成16种时态。下面我们主要复
习一下初中学过的6种时态
一、被动语态的用法
当我们不知道谁是动作的执行者，或者没有必要指出谁是动作的执行者，或者只需强调动作的承受者时，要用被动语态。如:
Cotton is grown in the north of China
These flowers are watered every day.
二、被动语态的构成:
被动语态由“be动词+及物动词的过去分词”
构成,be随主语的人称、数和时态的变化而变化。
被动语态可以用于各种时态，初中学过的主要有以下三种:
★一般现在时的被动语态，由“am/is/are+
及物动词的过去分词”构成。如:
I am praised by my mother
This watch isn t made in Switzerland
Such books are written for middle school
students
★一般过去时的被动语态，由“was/were+
及物动词的过去分词”构成。如:
He was encouraged to train for the high jump
in the past
Strawberries were grown on the farm last
year.
★一般将来时的被动语态，由“am/is/are
going to be+及物动词的过去分词”或“wibe+
及物动词的过去分词”构成。如
谓
I am going to be given a gift.
语
The cat is going to be raised by Tom
执
These problems are going to be solved soon
A meeting will be held at 3 p.m. tomorrow
补充
1.带情态动词的被动语态，由“情态动词+be+及
物动词的过去分词”构成。如:
Children should be allowed to choose their own
clothes
Those pictures can be seen on the Internet
2.英语中某些连系动词的主动语态可以表示被
动意义，如 smell, taste, sound, prove,fel等。
如
fish soun smells very fresh
