2ND BAT - UNIT 1 GRAMMAR REVISION EXERCISES

PRESENT PERFECT CONTINUOUS VERSUS PAST PERFECT CONTINUOUS

http://www.esl-lounge.com/student/grammar/3g59-present-past-perfect-continuous-error-exercise.php

P
PRESENT PERFECT SIMPLE VERSUS PRESENT PERFECT CONTINUOUS

http://esl.fis.edu/grammar/multi/ppsppc.htm

http://www.englishpage.com/verbpage/verbs7.htm

http://www.englishpage.com/verbpage/verbs8.htm

https://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/tests?test1

PAST PERFECT SIMPLE VERSUS PAST PERFECT CONTINUOUS

https://elt.oup.com/student/solutions/upperint/grammar/grammar_02_022e?cc=global&selLanguage=en

http://www.englishpage.com/verbpage/verbs13.htm

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-9553.php

PERFECT SIMPLE AND PERFECT CONTINUOUS TENSES

http://www.englishpage.com/verbpage/verbs14.htm