Peter's Intensive Grammar Website

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Verb "to be"
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Cambridge English Grammar in Use
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Present Perfect

Present Perfect exercises: Positive form Negative form Question form

IELTS Preparation: Present perfect and Past simple tenses
English Page: Verb Tense Exercise 5 (Present perfect/Past simple)
History of Snowboarding: verb tenses exercise
Sound Grammar: Past simple/Present perfect

http://edu.symbaloo.com/mix/verbtenses