Поставьте общий вопрос к предложениям. 1. many ex-soldiers are ill 2. the cause of gulf war syndrome remained a mystery постройте отрицание 1. many ex-soldiers are ill 2. the cause of gulf war syndrome remained a mystery

1. Are many ex-soldiers ill?
2. Did the cause of Gulf War Syndrome remain a mystery?
1. Many ex-soldiers aren't ill.
2. The cause of Gulf War Syndrome didn't remain a mystery.