你必须出席这个会议。

You must attend this meeting.

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除非情况对你来说不方便，否则你必须出席这次会议。

You must attend the meeting unless (it is) inconvenient to you.

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如果不这样做，你必须做的功课之前看到它们或出席任何会议。

If you don't, you must do the homework before seeing them or attending any meeting.

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In order to attend, you must know the date and the time. You can ask your friend, "When is your wedding?"

为了能够出席，你必须知道具体的日期和时间，你可以问你的朋友，“When is your wedding？”

When 课堂 - SpeakingMax英语口语达人