中高生の宿題・質問に答えるスレlesson52

[ If the teacher did not tell us [ to take all our books home on Friday ] ],
　　　現在の反事実は過去形　　　　　
no one would take all his books on a Friday,
反事実の話なので、過去形

[ because Friday is the day [ we get in the town and play after school ] ].