QUESTION FORMATION – PRESENT PERFECT SIMPLE AND CONTINUOUS

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https://elt.oup.com/student/englishfile/upperint3/grammar/file01/?cc=ar&selLanguage=en

https://elt.oup.com/student/englishfile/upperint3/grammar/file02/?cc=ar&selLanguage=en

http://speakspeak.com/english-grammar-exercises/upper-intermediate/present-perfect-simple-v-continuous


http://www.english-grammar.at/online_exercises/tenses/t076-present-perfect-simple-continuous.htm

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