Careless is "not exact, accurate, or thorough" or could be used to describe someone who does not pay attention to what they are doing. "A careless chef" might use the wrong ingredients and not notice, or make mistakes and not double check their work.
Sloppy is more like "messy" or "untidy." You could say "a sloppy chef" might spill something and not clean it up, or leave dishes piled in the sink.
But both words could mean that the chef is clumsy and/or untidy. The two words are almost interchangeable, just depending on context!
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Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
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