どうして息子は理解しないのか。。。４時までは遊んでいいけれど、４時から

どうして息子は理解しないのか。。。
４時までは遊んでいいけれど、４時からは宿題を終わらせて、それから遊び時間。。。
しかし、何度言っても、宿題を早く終わらせたら、遊び時間が長くなるということを理解しない。
理解力の問題なのか。。。

Results (English) 1:

Do not understand why my son?Finished my homework from 4: 00 until 4: good playing, but the play time from it.However, do not understand that to say many times, finish your homework early, play a long time.Comprehension issues?

Results (English) 2:

Why son does not understand. . .
And though I play until 4:00, you can finish the homework from 4:00, then play time. . .
However, to say many times, you do not understand that if you ended early homework, play time is longer.
Either of comprehension problems are. . .

Results (English) 3:

Why did my son do not understand. 4 to play better, but from time to time to finish the homework, then play. However, at some time, if I finish the homework as soon as possible and play a long time to understand. The problem of understanding.