Write affirmative sentences
Write negative sentences
Write questions
Write the correct form of the main verb
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises (MIXED PRES. PERFECT)
PRESENT PERFECT TIME EXPRESSIONS
http://www.usingenglish.com/quizzes/122.html (YET/ALREADY)
http://www.esl-lounge.com/student/grammar/2g7-just-yet-already.php (JUST/YET/ALREADY)
http://www.ego4u.com/en/cram-up/vocabulary/since-for (FOR / SINCE)
http://www.grammarbank.com/since-vs-for-exercises.html (FOR / SINCE)
http://www.grammarbank.com/ever-never-just-already-yet.html (TIME EXPRESSIONS)
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