你一定很开心吧 you must be completely psyched
一定很开心
Must be very happy
以上为机器翻译结果，长、整句建议使用 人工翻译 。
来参加卡拉OK晚会吧—一定很开心。
Come to the karaoke night—it should be a good laugh.
《牛津词典》
你这次旅行一定很开心吧！
Your trip must have been fun!
他授予你新球衣时一定很开心吧？
It must have been nice to be presented with your new shirt by him?
youdao
I know we will have a great time.
我们一定会过得很开心的。
I'm ~ing 实战 - SpeakingMax英语口语达人
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