这几个辞的意思和区别

in addition besides however nevertheless therefore

解题思路： 注意近义词的辨析
解题过程：
in addition to 和besides 是同义词 除了……以外（还有）

in addition to 中的 to是个介词，后面加名词，要想加句子的话，就得加个宾语式的 what to do, what is **那样的东东，besides 是个副词的时候，你可以当他不存在， 该怎么写句子就怎么写，当besides当介词用的时候后面可以加名词，动名词
nevertheless
ad.
1. 仍然,不过,然而
She was angry; nevertheless, she listened to me.
她很生气,但还是听了我的话。
We can\'t act on your advice. Nevertheless, thank you for giving it.
我们不能照你的建议去办。不过承蒙您提出来,十分感谢。

however
conj.
1. 然而,可是,不过
I feel a bit tired. However, I can hold on.
我有点累了,但我能坚持下去。
ad.
1. 无论如何,不管怎样
However hot it is, he will not take off his coat.
无论多热,他也不会脱掉外衣。
2. 不管用什么方法
However he tries, he never seems able to work satisfactorily.
不管他怎么努力,他好像总不能令人满意地工作。
3. 究竟怎样,到底如何
However did you know that?
你到底怎么知道那件事的? therefore因此,为此,所以的意思 therefore有两种用法，一在整句中，一在分句中。therefore是副词，但有时具有连词作用 。

一、整句中时一般不放句末，句首后要有逗号，句中1、按一般副词使用2、做插入语 （这两个分得清吧）
eg.1、Therefore，we must learn English well.
2、They therefore can learn English well.
3、Many fast food restaurant ,therefore,have red furniture or walls.
二、用在分句中，即一个句子一部分表示原因一部分表示结果。
这时一般词前要用分号，其后用不用逗号无所谓。若第二个分句前是逗号或无符号， 则要注意therefore是副词，和so不一样，要保持句子完整，应用and therefore。
eg.1、I had a headache;therefore I could not go to your party.
2、I was ill,and therefore could not come.
3、These birds are very beautiful and therefore liked by many people. 祝学习进步！！
最终答案：略