I couldn't learn English.
I couldn't eat by my self.
My parent's will not let me go outside by my self.
1 If everything is all night, my son will graduate from college next year.
2 I will do what he wants only after he asked me about it.
3 When you leave the room, please, make us a sign, and we will follow you.
4 We will have dinner when father comes back from work.
5 Before she translates the text, she will learn the new words.
6 When he returns to Moscow, he will call us.
7 If he doesn't go to the library tomorrow, he will be at home.
1 is
8 none
9 on
13 a
14 neither
15 are
Остальные предложения на мой взгляд правильные, а перечисленные выше слова являются лишними
Все, здесь, скорее, Сандкасл,