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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. 你把照相機留在計程車?yán)飳嵲谔恍⌒牧恕?/p>
該句式也可換成以“人”作主語的句子。如：
你犯這樣的錯誤真是粗心。
It was careless of you to make such a mistake.
=You were careless to make such a mistake.
注意，這樣用時句首的it為形式主語，不能改為 that。但是這類句子后面不出現(xiàn)不定式，那么句首的it也可換為 that。如：
It was very careless of him.=That’s very careless of him. 他太粗心了。
2. 比較be careless to do sth與be careless in doing sth：前者中的不定式為結(jié)果狀語，指由于粗心而做了某事;后者中的in doing sth表示時間，其中的in相當(dāng)于while，指在做某事時很粗心。如：
He was careless to make the mistake. 他很粗心，結(jié)果出了錯。
He was careless in typing the letter. 他打這封信時很粗心。
3. 表示“對……不在意或不關(guān)心”等，其后可接介詞 about, of, with 等。如：
He’s careless of [about] his speech. 他講話隨便。
She is careless of [with] his health. 她不注意身體。
He is careless with his pronunciation. 他對語音不注意。
Don’t be so careless with your money. 你花錢不要這樣隨便。
本文來自：逍遙右腦記憶 http://www.yy-art.cn/gaozhong/240264.html
相關(guān)閱讀：lie, lay, lain, laid, lying等的用法