If I have not loved you,how good it will

how well

B writes是动词,副词well修饰动词,how表程度,意思是他写的多么好啊!

作为习语用作介词时,as well as的涵义是“还有”、“不但…而且…”.
1.在A as well as B的结构里,语意的重点在 A,不在 B.因此,“He can speak Spanish as well as English．”的译文应该是：“他不但会说英语,而且会讲西班牙语”,决不能译作：“他不但会说西班牙语,而且会讲英语”.如果这样翻译,就是本末倒置了.
2.as well as和 not only… but also…同义,但前者的语意重点和后者的语意重点恰好颠倒.
如果 as well as用作连词引出比较从句,其义为“和…一样好”.因此,“He speaks Spanish as well as English．”应译作：“他说西班牙语像说英语一样好”.语意的重点依旧在前部,不在后半部.
注意 as well as以下的用法：
She called on you as well as I．
不但我来看你,她也拜访了你.
She called on you as well as me．
她不但拜访了我,也拜访了你.
在下列句中,as well as表示“像…一样”的涵义：
She as well as you is an English teacher．
她像你一样也是英文教师.
这里的谓语动词用is,不用are,因为句中的主语是she,不是she和you.
as good as…意思是 相等于,就像,几乎如；实际上,其实,实在.
例句:
A brave fellow is as good as his words, a swift horse needs no spurring.
勇者一言,快马一鞭.
A change of work is as good as a rest
调换一下工作是很好的休息
A miss is as good as a mile
失之毫厘,谬以千里对我有帮助
45

what good-looking boys they are

词性不同～good 是形容词,例：How good you are !→You are good .是跟在be 动词之后,作形容词成分的.而well 是副词,修饰动作等,例：How well you did !→You did well .所以两词中文都解释为“多么好”,但前者相当于中文的“的”,后者相当于“地”.(^-^)