also、too、as well、either与likewise这些词均含“也”之意。
also ：比too正式一些，语气较重，只用于肯定句，一般紧靠动词。
- She's fluent in French and German. She also speaks a little Italian.
她的法语和德语讲得流利，也会说一点意大利语。
too ：语气较轻，多用于口语，在肯定句中使用，通常位于句末。
- When I've finished painting the bathroom, I'm going to do the kitchen too.
我油漆完浴室后，还要油漆厨房。
as well ：一般不用否定句，通常放在句末，强调时可放在句中。
- They visited some factories, hospitals as well as the school.
他们参观了这所学校，还参观了工厂和医院。
either ：用于否定句，放在句末，之前加逗号。
- Pete can't go and I can't either.
皮特不能去，我也不能。
likewise ：是书面语用词。
- Her second marriage was likewise unhappy.
