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1·If you can't come, please ring me up.

如不能来，请打电话告诉我。《新英汉大辞典》

2·Please ring me up on Sunday morning.

星期日早上请打电话给我。

3·When you get there, ring me up.

你到达那儿后，给我来个电话。

4·You can call in or ring me up.

你可以来也可以给我打电话。

5·When you get home, ring me up.

你到家时，给我打电话。

6·Please ring me up tomorrow.

请在明天给我打电话。

7·Ring me up as soon as she arrives.

她一到就给我打电话。

8·Please ring me up at once.

请立刻打电话给我。

9·Don't fail to ring me up.

不要忘了给我打电话。

10·Don't fail to ring me up.

不要忘记给我打电话。