根据我(不靠谱)的直觉,also can比起can also会比较informal。
但查了资料后,其实两个写法都没有错,只是also can比较common。
举个例子:
1. Plasma may refer to one of the four fundamental states of matter, but it could also refer to a mineral aggregate.
2. Plasma may refer to one of the four fundamental states of matter, but it also could refer to a mineral aggregate.
两者都可以。(如果你怕错就写can also)
资料:
1. Can Also vs Also Can, which is more popular?
2. also can/ can also
3. Proper Use Of "Also" In Any Verb
4. Can Also Or Also Can?
5. Tico With A Doubt?