You don't have to work very hard to figure out what these different facial expressions mean.

你不必努力地去学习,去辨析不同面部表情的含义。

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Or perhaps, you could set a goal to lose weight and you could work very hard.

又或者，你制定了一个减肥的目标，你为此而努力坚持着。

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or work very hard there all the time.

或一直在那儿努力工作。

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So I had to work very hard.

所以我得很努力地工作。

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