http://www.focus.olsztyn.pl/en-exercises-for-present-simple.html#.XmukHKhKjIV
https://www.esl-lounge.com/student/grammar/1g43-to-be-multiple-choice.php
https://youtu.be/A_msHSKjh9Y
See the video up to minute 1:07
https://youtu.be/AtetWO5-DSI
See complete video