文档介绍：Unit 3 Online travel
Grammar
screen
keyboard
printer
mouse
U-disk
hard disk
Can you remember what they are?
What do we use it for?
We use it to type
It is used to type.
What do we use it to do ?
We use it to put the words and pictures onto paper.
It is used to put the words and pictures onto paper.
What do we use it to do ?
We move it with our hands to move the cursor on the screen.
It is used to move the cursor on the screen.
What do we use it to do ?
We use it to store information.
It is used to store information.
被动语态
被动语态的谓语部分由“be + 动词过去分词”构成,其中,句子的时态由be的时态体现。在含被动语态的句子中,主语是动作的承受者,如果要说明动作的执行者,前面用介词by引出。如:
English is used everywhere.
到处都在说英语。(一般现在时)
The small girl was taken to the hospital by her parents.
这个小女孩是由她的父母带到医院的。(一般过去时)
被动语态可用于多种时态中,以表示动作发生的时间不同。先让我们看看被动语态的各种时态结构形式:
结构
一般现在时
am / is / are+动词的过去分词
一般过去时
was / were+动词的过去分词
主动语态和被动语态的转换:
主:
被:
I
learn
English
English
is learned
me
+
+
+
+
by
The hill is very beautiful.
Do you climb it every day?
____it _______(climb) by the boy every day?
Is
climbed