1. too用于肯定句和疑问句，一般放在句尾，其前常加逗号。如：
We are in the same school, too. 我们也在相同的学校。
Do you play soccer every day, too? 你也每天踢足球吗？
2. also用于肯定句和疑问句，一般位于实义动词前、 be动词后。如：
Sandra is also a Korean student. Sandra也是一个韩国学生。
3. either用于否定句，一般放在句末。如：
They don&# 39; t know the answer, either. 她们也不知道答案。
4. as well as也有"也"的意思。如：
We have great mushroom pizza as well as soda.
He is a happy boy as well.
