Come to school in your old clothes tomorrow !
( 4 ) put on 强调“穿，戴”的动作，不能与表示持续性的时间状语连用。如：
He put on his coat and went out .
He put on his glasses to read the letter .
You don\'t need to put on your cap .
( 5 ) try on ( 试穿 ) ，表示动作，如：
I went to the tailors to try on my new suit .
Several pairs f shoes were tried on , but none of them were satisfactory .
Can I try it on ?
Mary was trying on a new dress .
23 . must be 的几种意义
［释疑］①在被动语态中，表示“必须，应当”即：
“must + be + 过去分词”，如：
Young trees must be looked after .
This thing must be handled with care .
A greenhouse must be built first .
This must be done as soon as possible .
②must be 表示一种推测，意思是“大概是”，“可能是”，“准是”，如：
He must be in the workplace now .
Grandpa Li must be over seventy now .
I\'m afraid you must be right .
Ah ! it must be more delicious !
③must be 表示“必须是”，“一定是”。如：
The ground must be just right — Neither too wet nor too dry .
The answers must be right .
24 . 表示命令、请求和指示的交际用语
［释疑］命令、请求或指示对方干什么或不要干什么，在英语中最常用的是第二人称祈使句，主语 you 通常不表示出来。祈使句的肯定式以原形动词开始，句首或句尾可以加 please ; 祈使句的否定式以“Don\'t + 动词原形”开始。例如：
Put the tree in the hole so that it is straight .
《九年级英语第十八单元Planting trees 植树(第5页)》出自：www.89xue.com网
www.89xue.com
Water the trees as often as possible .
Don\'t dig the hole too large .
25 . It\'s best to do sth . 最好是…… ( 干某事 )
［释疑］这是表示建议的交际用语，意思相当于“You\'d better do sth . ” ( 你最好干某事 ) 。如 It\'s best to plant trees in spring because it\'s warmer . ( = You\'d better plant trees in spring because it\'s warmer . )
It\'s best to water well when the earth is dry .
It\'s best to fill in the hole with earth .
It\'s best to harvest at the right time .
It\'s best to come to school in your old clothes tomorrow because we are going to plant trees in the park .
【 妙文赏析 】
The Lose Outweights the Gain
Joel Adams laments , “When we went on vacation two years ago , burglars broke in and stole ＄250 . So , last year I got smart , I left all the lights on and turned on all the radios and TV s . The burglars were afraid to show up and didn\'t get a cent — but the electric company got ＄523 ! ”
得不偿失
乔尔·亚当斯悲叹道：“两年前我们外出度假，家里没有人，小偷撬门进来偷走了250
美元。去年我学聪明了。我把屋里所有的灯、收音机和电视都打开。小偷不敢来了，一分钱
都没偷走，可电力公司向我们要去了523美元 ! ”
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