Teachers mark papers carefully.
Meaning: This means that people who teach others are writing on pieces of writing, such as essays or tests, to show that they have seen them or to give them a grade, with great attention and effort.
Choice of Words: Teachers are people who teach others, usually in a school. Mark means to write on something to show that you have seen it or to give it a grade. Papers are pieces of writing, such as essays or tests. Carefully means with great attention and effort. When you put them together, it means that people who teach others are writing on pieces of writing, such as essays or tests, to show that they have seen them or to give them a grade, with great attention and effort.
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Related Expressions