Study Grammar

GRAMMAR IS THE SOUL OF THE LANGUAGE.

http://elt.oup.com/student/englishfile/?cc=cz&selLanguage=cs


http://www.efl.ru/tests/

https://www.youtube.com/results?q=https://www.britishcouncil.org/learnenglish&rlz=1C1SAVU_enRU533RU537&espv=210&es_sm=122&um=1&ie=UTF-8&gl=RU&sa=N&tab=w1