コースについて
学生時代の夏休みの間にやること。
一緒に使う文法：
過去形: did do, was/were, was/were doing,
未来形: will do/be, will be doing, be going to do/be, shall do/be
可能: can do/be, could do/be, be able to do/be, might do/be, may do/be
希望: want to do/be, hope to do/be, plan to do/be
必要性: need to do/be, have to do/be, must do/be,
etc
