There is a small house among the trees .
［点拨］among 表示三者或三者以上的之间。
19 . mountain 山；山脉
It is difficult to get to the top this mountain .
They are climbing the mountain .
The mountains were covered with snow .
［点拨］in ( the heart of ) mountains 在 ( 深 ) 山中，a mountain of difficulties 困难重重。
20 . grow
①种植；栽培 ( 及物动词 )
In early spring we grow trees around our house .
②生长，成长 ( 不及物动词 )
Plants cannot grow without water .
The rice is growing fine .
He has grown into a fine young man .
③发展，增长 ( 不及物动词 )
They city is growing fast .
The population is not growing so fast in this area .
［点拨］grow 的过去式，过去分词为 grew , grown . grow 还可作系动词用，后接形容词作表语，grow up 长大，成人。
单元词组思维运用
1 . neither…nor 既不……也不
He is neither Japanese nor Chinese .
Neither he nor I know that .
［注意］当它用来连接两个主语时，其谓语动词的形式取决于后一个主语的人称。试比较：
Neither you nor I am right .
Neither you nor he is right .
Neither he nor you are right .
2 . knock…into 把……插进；把……敲进
Knock a long , strong stick into the earth next to the hole .
A long stick must be knocked into the earth .
Knock the nail into the wall , please .
3 . make sure 务必；查明；弄确实
Make sure that it is straight .
Make sure that all the windows are closed .
Make sure you get there on time .
I think there is a train at 5 : 15 , but you\'d better make sure .
Have you made sure of the time of the train ?
4 . in a few years\' time 几年之后
In a few years\' time , we hope to cover those mountains , too !
［注意］in… \'s ( s\' ) time , 表示“在某时间之后”，又如：
She is going to Beijing in three days\' time .
I\'ll be back in a week\'s time .
He will be back in an hour\'s time .
He has promised to pay me in three months\' time .
5 . tie…to 把…捆在 ( 拴在 ) ……
He tied the horse to the tree .
They tied the bad to the big tree .
When he woke up , he found himself tied down to the ground .
6 . be just right 正合适，合适的。
The weather is just right for travelling .
This book is just right for reading .
7 . stop…from doing 制止……不使……；阻止
It will stop the 《九年级英语第十八单元Planting trees 植树(第2页)》出自：www.89xue.com网
www.89xue.com sand from moving towards the rich farmland in the south .
The Great Green Wall will stop the wind from blowing the earth away .
8 . point to ( point at ) 指向，指引
He points to the high mountains far away .
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