1. He is very careless and works badly.
    他非常粗心，工作做得不好。

2. You forget everything, and sometimes you become careless and irresponsible.
    你把什么都忘记掉，而且有时你会变得粗心大意和不负责任。

3. Careless drivers cause many irreparable accidents.
    大意的司机造成许多无法挽救的意外。