Imperatives
祈使句
Imperatives are verbs that we use to:
祈使句是我们常用的动词
例如：
give orders
give instructions
give warnings
give advice
make requests
To form imperatives, we use theinfinitiveform of the verb withoutto, e.g.,
为了形成祈使句我们使用动词的不定式形式，
例如：
Sit down!
Stand up!
Come here!
If we want to make an imperative negative,we just adddon’tin front of the verb.
如果我们要把其实句变成否定句，只要在前面加上don’
例如：
Don’tgothere!
Don’tdothat!
The only time we use a subject forimperatives is when we want to include ourselves.
If we want to include ourselves, we uselet’sorlet’s not.
祈使句在包括自己的情况下要使用Let’s或者Let’s not
例如：
Let’ssit down.
Let’snotmeet tonight.
We can use imperatives for…
我们可讲祈使句用于：
Commands
指令
Be quiet!
Come here!
Instructions
说明
Go straight down the road.
Turn left at the corner.
Warnings
警告
Watch out!
Be careful!
Advice
建议
Don’t eat too much food.
Don’t smoke cigarettes.
Requests
请求
(we usually add “please”)
（我们经常加上“please”）
Please help me.
Please cook me some food.
Prepositions
介词
Prepositions help let us knowwheresomething is orwhensomething happens.
介词帮助我们知道物体的位置或者事情发生的时间
Some common prepositions are:
一些常见的介词：
in
on
under
next to
above
in front of
behind
in between
Prepositions usually come before a noun
介词通常出现在名词的前面：
例如：
The book isonthe desk.
The oranges areinthe refrigerator.
Your shoes areunderyour bed.
Time
时间：
Prepositions can also be used to talk abouttime.
介词也可以被用在讨论时间上。
Three common prepositions that can be usedto talk abouttimeare:
三个常见的介词可以被用在讨论时间：
on
at
in
Days of the week
星期几
Let’s go on Saturday.
I’ll see you on Monday.
Dates
日期
He was born on March 3rd.
They met on May 14th, 2008
Months and Seasons
月份和季节
I met her in November.
It’s cold in winter.
Homework:
回家作业：
复习上课学习祈使句&介词
回顾书上3.1练习
完成祈使句&介词Homework