A：Would you care to join for the picnic tomorrow?明天你能參加我們的野餐活動嗎?
    B：Much to my regret, I'll have to meet my girlfriend at the airport then.太遺憾了，明天我要去機場接我的女友。
    A：We'd like to invite you for our dress party tomorrow evening, are you free?我們想邀你們參加明晚的化裝舞會，有空嗎?
    B：Much as we'd like to, but we've booked up already for that time.我們很想去，但是明晚已有安排了。
    A：What a pity! You can't join us.你們不能參加，真可惜。
    B：So sorry. Next time we'll go, thanks anyway.實在抱歉，下次一定參加，不管怎樣還是要謝謝你。