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Adjective + Preposition: Exercise 1Exercise 2;
Adjective Order Before Nouns:
Exercise 1;
Adjectives: -ed and -ing endings (bored or boring?):
Exercise 1;
Adverb or Adjective?:
Exercise 1;
Article, definite:
Exercise 1; Exercise 2;
Common Mistakes (particularly among Spanish speaking learners)  (One of our most popular exercises!!)
Countable and Uncountable Nouns:
Exercise 1;
Do or Make?:
Exercise 1; Exercise 2;
Do, Make, Have, Get:
Exercise 1
For / Since / Until:
Exercise 1;
Gerund or Infinitive?: 
Exercise 1; Exercise 2; Exercise 3;
Exercise 5
Gerund or Infinitive - Special Cases:
Exercise 4 (Verbs with a change of  meaning, eg. remember, stop, etc)
Had better:
Exercise 1
Have something done:
Exercise 1;
Linking Expressions: 
Exercise 1
Must have done, can't have done, needn't have done:
Exercise 1
Nouns, Spelling of Plurals:
Exercise 1
Numbers and Dates
Exercise 1
Phrasal Verbs
Possessives and Reflexives (my, mine or myself?):
Exercise 1
Prepositions (Time):
Exercise 1; Prepositions (At, On, In): Exercise 1; Prepositions (Likes and Dislikes)
Prepositions (
Love and Relationships);  Prepositions (Cinema)
Question Tags, Basic: 
Exercise 1; Question Tags, Advanced: Exercise 1, Exercise 2
Reflexive and Reciprocal Pronouns (myself, yourself... / each other):
Exercise 1
Relative Pronouns:
Exercise 1
Say or Tell?
Exercise 1
So or Such or Such a/an?: 
Exercise 1
Some or Any:
Verb + Object + Infinitive: 
Exercise 1; Exercise 2
Verb + Preposition:  Exercise 1; Exercise 2

Future Perfect:  Exercise 1
Future Continuous: 
Exercise 1
First Conditional: 
Exercise 1;   Second Conditional:  Exercise 1;
Third Conditional: 
Exercise 1, Exercise 2
Verb Drills (Conjugation Exercises to help you master verb forms)
Present Simple or Present Continuous?:  Exercise 1
Present Perfect or Past Simple?: 
Exercise 1; Exercise 2
Present Perfect Simple or Present Perfect Continuous?:  Exercise 1
The Passive:
Exercise 1; Exercise 2
Fiesta ESL
Are you a film buff? (= movie lover, cinephile)   Practise your English surfing websites dedicated to cinema.
Fiesta ESL's Cinema Links
Fiesta ESL's Study Resources

For some extra help you might like to consult these when doing some of the exercises:

Verb Patterns Table (verbs + gerund or + infinitive, etc)
Irregular Verb Charts