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Nouns: plurals (crossword puzzle) Prepositions 1 (fill-in-the-blanks)
Nouns: possessive form (fill-in-the-blanks) Present simple 1 (fill-in-the-blanks)
The negative 1 (present simple and present continuous) (fill-in-the-blanks) Present simple 2 (affirmative, interrogative and negative) (scrambled sentences) 
  Irregular verbs list - pdf    
A, an, the or no article?-1 (fill-in-the-blanks) Prepositions 2 (fill-in-the-blanks)
 A, an, the or no article?-2 (fill-in-the-blanks) Prepositions 3  (fill-in-the-blanks) 
Article or no article? 1 (fill-in-the-blanks) Prepositions 4  (fill-in-the-blanks)  
Article or no article? 2 (fill-in-the-blanks)    
Adjectives - comparative (fill-in-the-blanks) The interrogative 1 (fill-in-the-blanks)
Avoiding mistakes (fill-in-the-blanks) The interrogative 2 (fill-in-the-blanks)
Passive voice (scrambled sentences) The negative 2 (fill-in-the-blanks)
Adjectives - superlative (fill-in-the-blanks) Questions ending in prepositions (scrambled sentences)
The negative 3 - anything, anywhere, either, etc.(fill-in-the-blanks) Verb tenses 1  (multiple choice)
The perfect vacation (scrambled sentences) Conditionals  (multiple choice)
Relative pronouns  (fill-in-the-blanks) Reduced relative phrases (fill-in-the-blanks)
Gerund, infinitive or bare infinitive? (multiple choice)