New Words：

useful [ˈjuːsfl] adj.有用的；有益的；实用的；有帮助的
helpful [ˈhelpfl] adj. 有用的;有益的;有帮助的

Sample Sentences：

He might be useful to us.
I'm so happy that it'll be useful for you.

The people I spoke to were very helpful.
I called the police but they weren't very helpful.
Is there anything you need to tell me that you think will be helpful?

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