not used with negative verbs
in addition; too
She's fluent in French and German. She also speaks a little Italian.
rubella, also known as German measles
I didn't like it that much. Also, it was much too expensive.
Jake's father had also been a doctor (= both Jake and his father were doctors) .
She was not only intelligent but also very musical.
Also is more formal than as well and too , and it usually comes before the main verb or after be .
I went to New York last year, and I also spent some time in Washington.
In BrE it is not usually used at the end of a sentence. Too is much more common in spoken and informal English. It is usually used at the end of a sentence.
‘I’m going home now.’ ‘I’ll come too.’
在英国英语中，as well的用法同too，但在北美英语中，as well显得正式或过时。
In BrE as well is used like too , but in NAmE it sounds formal or old-fashioned.
在否定句中要增加一个否定成分可用not ... either：
When you want to add a second negative point in a negative sentence, use not...either .
She hasn’t phoned and she hasn’t written either.
在肯定句中要增加一个否定成分可用not ... as well/too：
If you are adding a negative point to a positive one, you can use not...as well/too .
You can have a burger, but you can’t have fries as well.