I shall get back late, so don't sit up for me.

我要晚回来, 所以别熬夜等我.

《简明英汉词典》

Now Linda has her own key, we don't have to sit up for her any more.

现在琳达已有钥匙了, 我们用不着再坐等她回家了.

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I shall sit up for a time, in case I am wanted.

我先不睡, 说不定会用得着我.

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I shall get back very late, so don't sit up for me.

今晚我要晚回来, 不必等我回来再睡觉了.

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In the afternoon, he could sit up for two hours and able to do some walking.

下午已经能够坐立两个小时并能够有些走动.

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