If you want to study well, you must put in a lot of effort.
要想学习好，就得下功夫。
You must study hard if you want to study well.
如果你想学习好，你就得努力学习。
你一定要学好英语。
If you want to study well, must have a very strong body.
要想学习好，必须得有一个非常强健的身体。
If you want to study well, you must learn to budget your time well.
如果你想学习好，你必须学会合理安排自己的时间。
You will say: they must study well.
你会说：他们一定学习很好。
You will say: they must study well.
你会说：他们一定学习很好。
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