also

also, too, as well, either, 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。
too: 语气较轻，多用于口语，在肯定句中使用，通常位于句末。
as well: 一般不用否定句，通常放在句末，强调时可放在句中。
either: 用于否定句，放在句末，之前加逗号。
likewise: 是书面语用词。

副词 also:

1. in addition
   同义词：besides, too, likewise, as well

1. We should also take account of difficulties.
   我们也应该考虑到困难。
2. London was also called the modern Babylon.
   伦敦也被称为现代巴比伦。
3. Tom has been to Japan, I have also been there.
   汤姆曾去过日本，我也曾去过。