also , either , too , as well
also用于肯定句. You study English and I also study it。
你学英语，我也学。
either用于否定句，并放在句尾;
You don't study English and I don't study it either。
你不学英语，我也不学。
too和as well 用于肯定句，放在句尾，多用于口语。
例如：
You are a student and I am a student, too.
你是学生，我也是。
You know the way and I know it as well.
你知道路，我也知道。
