apuverbiharjoituksia
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-63918.php
BE ALLOWED TO -RAKENNE
https://www.montsemorales.com/gramatica/ObligProhib.htm
MUST, HAVE TO
https://www.englisch-hilfen.de/en/exercises/tenses/have_to.htm
HAVE TO /HAS TO = TÄYTYY, PITÄÄ
https://www.englishclub.com/grammar/verbs-modals-can-could-able-quiz.htm
CAN /COULD /BE ABLE TO = OSATA, VOIDA, PYSTYÄ