如果他出了什么事，请立刻通知我。

If anything happens to him, let me know at once.

《新英汉大辞典》

如果他出了什么事，请一定通知我。

If anything happens to him, do let me know.

youdao

假如他离开，请通知我。

In case those he leaves, please inform me.

youdao

无论他什么时候来，请通知我。

No matter when he comes, please let me know.

youdao

如果他离开，请通知我。

In case that he leaves, please inform me.

youdao

如果他回来了，请通知我。

If he comes back, please let me know.

youdao

如果他回来了，请通知我。

If he comes back, please let me know.

youdao