VOA一分钟英语：不定式 to do 的三种用法

动词不定式 “to do” 是英语中最常见的结构之一，它用法灵活多样，令不少英语学习者困惑不已。
 
Hi, everyone. Welcome back to English In A Minute. I’m James and today we’re going to talk about three different uses of the infinitive with ‘to’.
We can use an infinitive with ‘to’ after an adjective.
It’s easy to learn English with the BBC.
Another way to use the infinitive with ‘to’ is to talk about the purpose, or the reason, for something.
For example: I went to the shops to buy some milk.
So, in this example I’m saying that the reason I went to the shop was to buy milk.
Finally, use the infinitive with ‘to’ after quantifiers. The structure for this is: quantifier + noun + infinitive with ‘to’.
For example: I have too many emails to send.
Or: There isn’t enough time to get to the station.
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用法总结
1 我们可以在形容词后加上不定式 “to do”，即：形容词 + 不定式 “to do”。 
It’s easy to learn English with the BBC.
We’re always happy to help!
It’s fun to spend time with friends.
That’s hard to say.
 
2 我们可以用不定式 “to do” 表示做某事的目的或理由。
I went to the shops to buy some milk. 
I am working to save money.
Don’t make that face to scare him! 
Join us on social media to learn more English.
 
3 我们可以在量词后使用不定式 “to do”，结构是：量词 + 名词 + 不定式 “to do”。
I have too many emails to send.
There isn’t enough time to get to the station.
There are few pencils left in the studio to draw blueprints with.