We didn't see a single solutions of the problem - Мы не видели ни одного решения проблемы.
составить все возможные во все 5 шт - 1)общий 2) специальный 3) разделительный 4) во к подлежащему 5) во к дополнению)​

We didn't see a single solutions of the problem

Didn't we see a single solutions of the problem? общий

Why didn't we see a single solutions of the problem? специальный

Didn't we or you see a single solutions of the problem? альтернативный  

Who didn't see a single solutions of the problem? к подлежащему

We didn't see a single solutions of the problem, did we? разделительный