1. When am I allowed to leave the hospital?

我什么時候能出院？

還能這樣說：

When can I be discharged?

How soon can I be released from the hospital?

應用解析：

allow for sb./sth. 在計算、估計、考慮時包括某人或某事物；

allow of sth. 容許某事物；對某事物留有余地；

allow of no excuse 不容辯解

2. It's hard to say. It depends on your recovery.

很難說，這得看你的恢復情況了。

還能這樣說：

It's difficult to say. If you have a good recovery, you can leave the hospital.

You can be released from the hospital after recovery.

應用解析：

You may depend upon it.

肯定無疑，放心好了。

3. Can you tell me why I can't be discharged now?

你能告知我現在為什么不能出院嗎？

還能這樣說：

Will you please tell me the reason why I can't be released from the hospital?

Could you tell me the reason why I can't leave the hospital?

應用解析：

discharge a gun 開炮；

discharge one's pistol in the air 假打，佯擊；

discharge sb. from an obligation 免除某人的義務；

bad conduct discharge 撤銷軍職

4. You are going to be discharged tomorrow.

您明天就可以出院了。

還能這樣說：

You are allowed to be discharged from hospital tomorrow.

You will be discharged from hospital tomorrow.