Past Simple:
1) I couldn't follow your advice.
2) He could ask you some personal questions.
3) She couldn't relax
4) Could they move into a new flat?
5) We couldn't learn the rule.
Future Simple:
1) I will can't follow your advice.
2) He will can ask you some personal questions.
3) She will can't relax.
4) Will can they move into a new flat?
5) We will can't learn the rule.