Li know how to use past modals could and had to. complete the sentences with could and had to. i by the time mozart was four he could play the violin. 1 by the time/mozart/four/play the violin (could). 2 marie/do chores/yesterday (had to). 3 bobby/study english/last night (not have to). 4 the knights/pull the sword/out of the stone (could not). 5 john/ride a bike/when he was three (could not).