You should try a little harder. (你应该再努力一点儿。)

有点自尊心吧!

Respect yourself.

我希望你事事要积极。

I hope you'll be more positive overall. *positive “积极的”。

I don't think I can do it. (我觉得我做不了。)

I hope you'll be more positive overall. (我希望你事事要积极。)

I hope you'll be more positive in every way.

I wish you'd be more positive.

You should be more optimistic. (希望你能乐观点儿。) *optimistic “积极的”、“乐天派的”。

你说得容易。

That's easy for you to say.

If you practice hard, you'll get a gold medal. (如果你刻苦练习，一定能够得金牌。)

That's easy for you to say. (你说得容易。)

你发什么牢骚?

There's no reason for complaints. *complaint “不满”、“抱怨”、“诉苦”。

There is no reason to complain.

There is nothing to complain about.

你脸上都写着呢呀!

It's written all over your face.

Did you pass the exam? (考试都通过了?)

How did you know? (你怎么知道的?)

It's written all over your face. (你脸上都写着呢呀!)

It's obvious. (明显地能看出来。) *obvious “一眼就能看出来的，明显的”。

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