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1. 表示某人做某事很粗心，通常用于it is careless of sb do sth。如：

It was careless of you to leave your camera in the taxi. 你把照相机留在计程车里实在太不小心了。

该句式也可换成以“人”作主语的句子。如：

你犯这样的错误真是粗心。

It was careless of you to make such a mistake.

=You were careless to make such a mistake.

注意，这样用时句首的it为形式主语，不能改为 that。但是这类句子后面不出现不定式，那么句首的it也可换为 that。如：

It was very careless of him.=That’s very careless of him. 他太粗心了。

2. 比较be careless to do sth与be careless in doing sth：前者中的不定式为结果状语，指由于粗心而做了某事;后者中的in doing sth表示时间，其中的in相当于while，指在做某事时很粗心。如：

He was careless to make the mistake. 他很粗心，结果出了错。

He was careless in typing the letter. 他打这封信时很粗心。

3. 表示“对……不在意或不关心”等，其后可接介词 about, of, with 等。如：

He’s careless of [about] his speech. 他讲话随便。

She is careless of [with] his health. 她不注意身体。

He is careless with his pronunciation. 他对语音不注意。

Don’t be so careless with your money. 你花钱不要这样随便。

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