Exercise 2: if / unless
Exercise 3: if / unless
Exercise 1: in negative sentences
Exercise 2: in affirmative sentences
Exercise 3: in questions
Exercise 4: in subordinate clauses
Exercise 5: of adverbs of time.
Exercise 1: noun-adjective
Exercise 2 : noun- adjective
Exercise 3: verb- noun
Exercise 4: verb - noun
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