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PRESENT PERFECT

http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?03
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?04
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?05
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?06
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?07
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
http://www.better-english.com/grammar/pspp1.htm

CAN

http://www.english-grammar-lessons.com/can/exercise1.html
http://www.english-grammar-lessons.com/can/exercise2.html
http://www.english-grammar-lessons.com/can/exercise3.html
http://www.english-grammar-lessons.com/can/exercise4.html
http://www.english-grammar-lessons.com/can/exercise5.html
http://www.english-grammar-lessons.com/can/exercise6.html

CAN , COULD, TO BE ABLE TO

http://www.englishclub.com/grammar/verbs-modals_can_quiz.htm
http://www.englisch-hilfen.de/en/exercises/modals/can.htm