3. Перевести слова и выделить суффиксы и префиксы:
communication - communicate - communicative
information – informate – informative
national – nationality – international
frequent – frequency –
exchange – change – changeable
user – use – useful
subscribe - , subscriber - prescribe
automatical – automatically – automatic

4. Подберите антонимы к данным словам:
Changeable, frequent, quick, automatic, convenient, approximate.