恐怕我不能参加你的晚会了，因为我有好多事情要做。
I am afraid I cannot attend your party, for I have too many things to do.
我很遗憾不能来参加你的晚会，因为我正忙于他的研究。
It's a pity I can't attend your party, because I am busy with his research.
我很遗憾不能来参加你的晚会，因为我正忙于他的研究。
It's a pity I can't attend your party, because I am busy with his research.
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