看看下面的句子,你就懂了;
1 If he had worked hard 30 years ago,he would have become very rich.
(這一句講的都是過(guò)去的事情,與“現(xiàn)在”沒(méi)有聯(lián)系)------這叫單一虛擬語(yǔ)氣句子
==He didn't work hard 30 years ago,so he didn't become very rich.
2 If he had worked hard 30 years ago,he would be very rich today
（這一句叫多重虛擬語(yǔ)氣句,因?yàn)樗袃煞N不同的虛擬語(yǔ)氣.他過(guò)去沒(méi)有努力賺錢(qián),所以他今天不富有.------“過(guò)去”與“現(xiàn)在”互相聯(lián)系著.）
=== He isn't very rich taday because he didn't work hard 30 years ago.
你的句子也是這個(gè)原理：
If the flower had been watered,it wouldn't be daed as it is now.
== The flower is dead now because it wasn't watered.
明白了嗎?