if clauses - if sentences
Practise English conditionals online 
free exercices on conditional sentences

Zero conditionals: 
present simple in the conditional clause (if clause) - present simple in the main clause
Exercise 1 fill-in exercise (gap fill) , exercise 2 , exercise 3 , exercise 4 , exercise 5 
Exercise 6 choose
Exercise 7 multiple choice
Exercise 8 Make sentences using the zero conditional
Exercise 9 Answer a zero conditional question: multiple choice
Exercise 10 Combine
Type 1 conditionals / first conditionals:
present simple in the conditional clause - future simple (will) + infinitive in the main clause
Exercise 1 gap-fill exercise
Exercise 2 multiple choice , exercise 3 ,
Exercise 4 fill-in the gaps, exercise 5 , exercise 6 , exercise 7 , exercise 8 , exercise 9 also downloadable as a pdf-file (scroll down to see the exercise) , exercise 10 ,
Exercise 11 Conditionals in negative sentences: fill-in exercise
Exercise 12 Future Real Conditional (fill-in exercise)
Exercise 13 Rewrite the sentences
Type 2 conditionals / second conditionals:
past simple in the conditional clause - future of the past (would) + infinitive in the main clause
Oefening 1 fill-in exercise , exercise 2 , exercise 3 , exercise 4 , exercise 5 (downloadable as pdf file) ,
Exercise 6 Present Unreal Conditional  
Exercise 7 choose , exercise 8 multiple choice , exercise 9 chosse (scroll down for the exercise)
Type 3 conditionals / third conditionals:
Past perfect (pluperfect) in the conditional clause - would have + participle in the main clause
Exercise 1 fill-in exercise
Exercise 2 Past Unreal Conditional , exercise 3 , exercise 4 (also as Pdf download) , exercise 5 choose , 
Mixed conditionals (combination of type 2 and type 3):
Exercise 1 first there's an explanation of the mixed conditional: scroll down for the exercise (multiple choice), 
Exercise 2 , exercise 3 ,
Exercise 4 fill-in exercise , exercise 5 do "practice 5 - 8" below 
Exercise 6 more difficult fill-in exercise
Mixed exercises on the conditionals
Exercise 1 all types of conditionals mixed (multiple choice) , exercise 2 , exercise 3 (44 questions) , exercise 4 , Exercise 5 , exercise 6 (quiz) , exercise 7 , exercise 8 ,
Exercise 9 all conditional types mixed (fill-in exercise) , exercise 10, exercise 11 ,
Exercise 12 fill-in exercise (type 1, 2 , 3) , exercise 13 , exercise 14 , exercise 15 , exercise 16 , exercise 17 ,
Exercise 18 (type 1 and 2) , exercise 19 , exercise 20 , exercise 21 ,
Exercise 22 matching exercise
Exercise 23 multiple choice questions (type 1 and 2)
Exercise 24 multiple exercises (first, second, third conditional), 
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