AS WELL AS
Explanation: in English
English Grammar: explanation + good examples + exercises offline
Exercise 1: choose the correct verb form (offline)
Exercise 2: join the sentences using AS WELL AS
ALSO -TOO - EITHER
Explanation: in English, with examples
Explanation + exercises: change the sentences form affirmative to negative
Exercise 1: choose also, too, either
Exercise 2: ADDITION . Two-answer-choice (furthermore, what's more, moreover, as well as, in addition to, besideas, also)