I study hard to get good grades.
Meaning: This means that I put in a lot of effort to learn and understand things in order to get high marks in school.
Choice of Words: Study means to learn and understand something. Hard means with a lot of effort. Good means something that is positive or desirable. Grades are marks that show how well you have done in school. When you put them together, "I study hard to get good grades" means that you put in a lot of effort to learn and understand things in order to get high marks in school.
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Related Expressions