поставьте предложения в вопросительную и отрицательную форму: They take readings every

1. They take readings every 30 second. - Do they take readings every 30 second? - They dont take readings every 30 second.
2. The professors assistant always shows us experiments in the laboratory. - Does the professors assistant always show us experiments in the laboratory? - The professors assistant doesnt always show us experiments in the laboratory.
3. My friends go somewhere in summer. - Do my friends go anywhere in summer? - My friends go nowhere in summer.