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He improved on his invention. 他把他的发明作了改进。

He went to the police and informed against (on) the criminals. 他向警察告发了那些犯罪分子。

The pilot inquired about the weather conditions. 飞行员询问天气情况。

She inquired after my mother (my mother's health). 她问候了我的母亲。

A man has been inquiring for you at the office. 有人到办公室要求见你。

The police inquired into her background. 警察调查了她的背景。

She insisted on writing at once. 她坚持要马上写信。

No one wants to interfere with you. 没人想干预你的事。

This would involve him in serious trouble. 这会使他陷入很大的麻烦。

Finally they ironed out their differences. 最后他们消除了分歧。