https://www.ego4u.com/en/cram-up/grammar/relative-clauses

http://www.bbc.co.uk/worldservice/learningenglish/general/sixminute/

These are some grammar ex. on two levels; the first level consists only in filling blanks with the corresponding tense, whereas the second level demands a bit more skill as it consists in creating conditional sentences from everyday situations. Try it !

Conditional ex.

Grammar ex.

Learn English free online

Grammar exercises to put in practice these adverbs

Still, Yet and Already

Past Simple and Past Continuous

Past Simple and Present Perfect

Interactive English through the British Council

Interactive learning English through the BBC

Grammar exercises

Grammar exercises

Prepositions : explanations, examples and exercises

Grammar exercises and activities

      grammar ex. with modals

exercises-with-too-and-enough.doc

exercises-with-too-and-enough.docexercises-with-so-and-such.doc

MAY ex 4th ESO

grammar exercises with IF or UNLESS. Choose the best option.

http://www.usingenglish.com/quizzes/23.html