I know that all of you worked hard to make this conference happen.
我知道你们为了这次会议的成功召开付出了很大的努力。
You have worked hard all day. You must be tired.
你辛苦干一整天，一定累了。（对现在情况的推测判断）
If you look at the people who've done great work, one thing they all seem to have in common is that they worked very hard.
如果你看看完成伟大的工作的人，他们共同点似乎都是非常努力地工作。
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