also用在句中(一般放在be动词和助动词之后,行为动词之前). she also is good at English. she also like English. too 多用于口语,位于句未或句中,只用于肯定句,其前常有逗号. They are students,too.=They,too,are students. 否定句为They are students,either. as well 用于肯定句,通常位于句中或句尾. He knows French,and he knows English as well.
too, as well和 also用于肯定句和疑问句,too和as well多用于口语,一般放在句末,而also多用于书面语,一般放在句中与动词连用。either 用于否定句和否定的疑问句,往往放在句末。如: He went there too. He didn't go there either. I like you as well. I ...