重点词组解析
1. plenty of充分的，大量的，既可修可数名词又可修不可数名词，只用于陈述句，
在疑问句中一般用enough，在否定句中用many 或much。
注意：plenty of前面没有冠词a, 不可误记成a plenty of。
Make sure there is plenty of food for everyone. We have plenty of chairs here.
in plenty 充足地
There is food in plenty. =There is plenty of food.
2．be careful用法归纳
(1)be careful 单独使用，当心
Be careful！The pan is hot! 当心！锅很热。
(2)be careful about…对……谨慎
I hope you’ll be careful in future about the things you say.我希望你将来对所说事谨慎。
(3)be careful of…留神……
We have to be careful of what they are doing.我们得留神他们做的什么。
(4)be careful with…注意……
You must be more careful with your work.你们需注意你们的工作。
有时be careful表示吝啬。
He’s too careful with his money; he never buys a drink for anyone.
他太吝啬了，他从不给别人买杯水。
(5)be careful not to do sth. 小心不要做……
We want to be careful not to break anything.我们要小心不要打破任何东西。
(6)be careful+从句 加以小心
Be careful what you do. 小心你做的一切。
3．keep up with 跟上（防止落后）
keep up with the class 跟上班级（不掉队）
keep up with the development of society 适应社会的发展
keep up with the going on 跟上时尚
注意：catch up with （已经落后）赶上
4．Be +adj +to短语
(1)be harmful to…对……有害
be +adj. +to sb. /sth. 指对某人或某物有……影响或态度如何。
be good to…=be kind to…对……态度好
be friendly to…对……友好
be cruel to…对……凶残
be bad to…对……态度不好
be polite/impolite to…对……有礼貌/无礼貌
be rude to…对……粗鲁
5．cut短语总结：
(1)cut into…把……切成
Vegetables should be cut into small pieces and dropped into the boiling water.
蔬菜应切成小碎块放进开水里。
(2)cut up 切碎
Mom is cutting up the meat to make dumplings.妈妈正剁肉准备包饺子。
(3)cut down 砍倒；削减
If you cut down the trees, you will ruin the land.如果你砍伐树木，就会毁坏土地。
I have decided to cut down my smoking. 我决定戒烟。
(4)cut off 切断，停掉
Our water supply has been cut off again. 我们的供水再次中断。
6．Short短语
(1)be short of 缺少
I’m short of money this week, can you lend me some？这星期我缺钱，你能借我一点?
(2)run short 几乎用光
We’ve run short of oil. 我们已经用光油了。
The supply of oil is running short. 供应的油快要用光了。