difference between also, as well, and too

The adverbs also, as well and too have similar meanings, but they do not go in the same position in sentences. Also is usually used with the verb. Too and as well usually go at the end of a sentence or clause. Note that ‘as well’ is not very common in American English.

also - (бас) Also comes after the verb.
as well - (мөн, бас)As well is more formal the others. and always at the end of sentence
too - (мөн, бас) informal and "too" used in more spoken English than in written English. always at the end of sentence

difference between as well, too, and also

• However, my trouble is with too and as well, I have been reading and I just found that as well is not common in American English, and regarding with the examples that I have found, those adverbs have the same meaning and you can use them in the same way and always at the end of the statement.

             She was smart, she studied so much as well.
             She was smart, she studied so much too.

• Reading and hearing English is the best way I know to get to know what is typical and common for native speakers and writers. "Too", "also", "as well", "additionally", are all generally common, with "too" probably being the most informal of the list. It's been my experience to hear "too" used in more spoken English than in written English. 

• The adverbs also, as well and too have similar meanings, but they do not go in the same position in sentences. Also is usually used with the verb. Too and as well usually go at the end of a sentence or clause. Note that ‘as well’ is not very common in American English.

          

• "As well", "also" and "too" have the same meaning - "anche". The difference is their position in the sentence.
  
  We can sometimes leave out the subject as well.
  
  We can sometimes leave out the subject too.
  
  We can also sometimes leave out the subject.
  
  Using "as well" can give a little more emphasis to the word "anche".

• As well and too go to the end of a sentence (a clause)
  As well is more formal the others.
  Also comes after the verb.