too一般都是在句末用,
also一般跟在主语后面,
as well as 一般后面都跟一个前面并列的词或句子.
1L很对,我补充一下.
also的位置有很多
eg：Also,you have to do homework.
I can also speak English
也可以在省略句中放在句末
too只能用于肯定句,否定句中用either代替,前面要逗号.
as well as在句末,但前面不加逗号