九年级英语第十八单元Planting trees 植树

九年级英语第十八单元Planting trees 植树,标签：初三下册英语教案,初中英语教案,http://www.67xuexi.com

21 . Is it straight ? More or less . 树放直了吗 ? 基本上是直的。

［释疑］more or less “或多或少，差不多”。例如：

What he said is more or less true .

22 . 同义词 wear , dress , in , put on , try on 的区别

［释疑］ ( 1 ) wear ( 穿，戴 ) ，表示穿着的状态，它不仅可以表示“穿着”某种

衣服，还可广义地用于穿鞋、穿袜、戴帽、戴手表、戴眼镜等。如：

She was wearing a red dress ( a pair of white gloves , glasses , a gold ring , a new watch ) at the ball that night . 那天晚上在舞会上她穿着红色连衣裙 ( 戴着一副白手套，眼镜，一枚金戒指，一块新手表 ) 。

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( 2 ) dress ( 穿，穿着 ) ，既可表示穿着的动作，又可表示穿着的状态，只用于穿衣。当 dress 作及物动词时，后面的宾语只能是人。

Have you finished dressing ?

He dressed and went out .

She was dress in with .

Mother dressed the child .

( 3 ) in ( 穿着，身着 ) ，表示状态。in 是介词。

The PLA men are in green uniform .

The comrade in blue is director of the play .

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 .

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

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