Would you care to join for the picnic tomorrow?
明天你能参加我们的野餐活动吗？
BMuch to my regret, I'll have to meet my girlfriend at the airport then.
太遗憾了，明天我要去机场接我的女友。
AWe'd like to invite you for our dress party tomorrow evening, are you free?
我们想邀你们参加明晚的化装舞会，有空吗？
BMuch as we'd like to, but we've booked up already for that time.
我们很想去，但是明晚已有安排了。
AWhat a pity! You can't join us.
你们不能参加，真可惜。
BSo sorry. Next time we'll go, thanks anyway.
实在抱歉，下次一定参加，不管怎样还是要谢谢你。
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