请问高手们一个英文文法问题
(就算不是高手也欢迎参与讨论)
http://imgur.com/a/1wZS2
(赖世雄老师文法书)
If it were not.....
If it had not......
But for......
这些我懂
例一：
But for your help, I would fail.
(要不是你的帮助，我已失败)
(与现在事实相反的假设语气)
例二：
But for your help, I would have failed.
(要不是你当时的帮助，我那时早已失败)
(与过去事实相反的假设语气)
这些我懂
外加赖氏文法书跟其他文法书都说：
“本句型限使用于与现在事实相反跟与过去事实相反的假设语气中”
所以我想问的是
那未来的事情要怎么讲？
例三：
要不是你明天会来，我现在才不须要订餐厅。
(要怎么翻？？)
But for your coming tomorrow, I would not have to book the restaurant.
(感觉一定是错的)
还是很直观地翻
If it is not because you are coming tomorrow, I would not have to book the
restaurant.
例四：
要不是你明天会来，我昨晚才不须要订餐厅。
(要怎么翻？？)
But for your coming tomorrow, I would not have had to book the restaurant
last night.
(感觉一定是错的)
还是很直观地翻
If it is not because you are coming tomorrow, I would not have had to book
the restaurant last night.
所以我想问的是
既然
If it were not.....
If it had not......
But for.....
这三者都不能用于未来
那未来的事情要怎么讲？
感谢各位高手们！！！