A is to B what C is to D 的句型,将what从句放句首

A is to B what C is to D 的句型,将what从句放句首
这个固定句型在曲一线的教辅上给的其中一个例句是：Air is to us what water is to fish.
书上说有时可以把what从句放在句首,其中一个例句是：What the leaves are to the forest the are to the world.
这个固定句型在曲一线的教辅上给的其中一个例句是：Air is to us what water is to fish.
书上说有时可以把what从句放在句首,其中一个例句是：What the leaves are to the forest the are to the world.
我想把第一个句子改写成第二种格式,但是发现一个问题——到底要不要加冠词“ the”,或者逗号?我注意到原句式中书本所给的所有例句主句都是无冠词的,但是在what提前的所有例句中,主句名词都是带冠词的,那在句型转换的时候要不要添加冠词呢?也就是说,到底是改写成：What water is to fish air is to us.还是改成：What water is to fish the air is to us.如果不需要加冠词,那要不要在air前面加个逗号呢?不然我总觉得读起来别扭.
另外,我在网上还看到另一种句式：what water is to fish is what love is to mankind.这种写法是对的吗?
字挺多的,也许是我钻牛角尖了.