句型说明：

1. “If it (be) not for …” 是常见的虚拟条件句的句型，意思是“要不是…”，相当于but for和without。

 If it were not for the leadership of the party, we could not be living a happy life today.

要是没有党的领导，今天我们就不会过上幸福的生活。

If it had not been for your help, we would not have achieved so much in our work.

要不是你的帮助，我们就不会在工作中取得这么多成绩。

2. 含蓄条件句可以看成是条件句的简略形式。

If we had your support, we might succeed in performing our task.

= With your support, we might succeed in performing our task.

要是有了你的帮助，我们就会成功地完成任务。

Even if there were air and water, plants still couldn’t grow on the moon.

= Even with air and water, plants still couldn’t grow on the moon.

即使有了空气和水，植物也仍然不能在月球上生长。