Websites to practise grammar

http://www.agendaweb.org/verbs/to-be-exercises.html  (to be)

http://www.agendaweb.org/verbs/to-have-mixed-exercises.html  (have got)

http://www.agendaweb.org/grammar/there_is_are-exercises.html (there is / there are)

http://www.agendaweb.org/verbs/present_simple-exercises.html (Present simple)

http://www.agendaweb.org/verbs/present_continuous-exercises.html (Present Continuous)

http://www.englishexercises.org/makeagame/viewgame.asp?id=1098 (Present Simple and Continuous)

http://www.agendaweb.org/verbs/present-progressive.html (Present Simple and Continuous)

http://www.learnenglishfeelgood.com/esl-mixed-modals1.html  (modal verbs)

http://www.agendaweb.org/grammar/comparison-exercises.html (comparative adjectives)