立彬の日本語
疲れているならそんなに一生懸命勉強しなくてもよいです。
tbd
You don't have to work so hard if you're tired.
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疲れる， つかれる
1. to get tired, to tire, to get fatigued, to become exhausted, to grow weary
2. to become worn out (of a well-used object)
3. to starve
感到疲倦、变得疲惫、感到疲惫不堪、变得精疲力竭、变得厌倦；变得破旧不堪(对于经常使用的东西而言)
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そんなに
1. so much, so, like that
tbd
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一生懸命， いっしょうけんめい
1. very hard, with utmost effort, as hard as one can, with all one's might, for dear life, eagerly, desperately
全力以赴，尽全力
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勉強， べんきょう
1. study
2. diligence, working hard
3. experience, lesson (for the future)
4. discount, price reduction
学习
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なくてもいい， なくてもよい， なくても良い， 無くても良い
1. need not, (not) have to
2. need not have, need not exist
不必；没有必要；不必如此，不必存在