九年级英语第十八单元Planting trees 植树
ften stopped myself from doing something wrong .
You must stop that big dog from coming into the house .
16 . They must be built all over world . 全世界都必须营造绿色长城。
［释疑］含情态动词的被动语态结构：情态动词 + be + 过去分词，又如：
This work must be finished in a week .
The trees should be watered often .
In south China , rice may be harvested three times a year .
17 . Many thousands of trees must be planted every year . 每年都得裁成千上万株树。
［释疑］ ( 1 ) many thousands of“数千；万千上万”，thousand 在此是名词。又如：hundreds of 好几百, millions of 数百万
( 2 ) hundred , thousand , million 也常常用作数词，此时后面不能加 s。例如：
We\'ve learned about eight hundred English words .
That farmer had over five thousand ducks .
18 . The more , the better . 越多越好。
［释疑］这种句式的结构为：“the + 比较级，the + 比较级”，意为“越……越……”。请看：
Ask all of them to come to the party . The more , the better .
Start your work . The sooner , the better .
The more I think of it , the happier I am .
The harder you work , the greater progress you will make .
19 . This year alone , we\'ve already planted ten thousand trees . 仅仅在今年，我们已经裁了一万棵树。
［释疑］alone 是形容词，在句中意为“仅仅”。又如：
The people live by bread alone .
We all think that he alone can do it .
20 . But we\'re growing a lot more now , thanks to the Green Wall . 然而，幸亏有了绿色长城，我们现在种植了更多的粮食作物。
［释疑］thanks to…构成副词短语，意为“幸亏”，“由于”例如：
Thanks to their help , we won the match .
We arrived at the railway station in time , thanks to that bus driver .
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 ) 。
( 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 .
《九年级英语第十八单元Planting trees 植树(第5页)》
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You must stop that big dog from coming into the house .
16 . They must be built all over world . 全世界都必须营造绿色长城。
［释疑］含情态动词的被动语态结构：情态动词 + be + 过去分词，又如：
This work must be finished in a week .
The trees should be watered often .
In south China , rice may be harvested three times a year .
17 . Many thousands of trees must be planted every year . 每年都得裁成千上万株树。
［释疑］ ( 1 ) many thousands of“数千；万千上万”，thousand 在此是名词。又如：hundreds of 好几百, millions of 数百万
( 2 ) hundred , thousand , million 也常常用作数词，此时后面不能加 s。例如：
We\'ve learned about eight hundred English words .
That farmer had over five thousand ducks .
18 . The more , the better . 越多越好。
［释疑］这种句式的结构为：“the + 比较级，the + 比较级”，意为“越……越……”。请看：
Ask all of them to come to the party . The more , the better .
Start your work . The sooner , the better .
The more I think of it , the happier I am .
The harder you work , the greater progress you will make .
19 . This year alone , we\'ve already planted ten thousand trees . 仅仅在今年，我们已经裁了一万棵树。
［释疑］alone 是形容词，在句中意为“仅仅”。又如：
The people live by bread alone .
We all think that he alone can do it .
20 . But we\'re growing a lot more now , thanks to the Green Wall . 然而，幸亏有了绿色长城，我们现在种植了更多的粮食作物。
［释疑］thanks to…构成副词短语，意为“幸亏”，“由于”例如：
Thanks to their help , we won the match .
We arrived at the railway station in time , thanks to that bus driver .
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 ) 。
( 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 .
《九年级英语第十八单元Planting trees 植树(第5页)》
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