1.They take readings every 30 second.
They don't take readings every 30 second.
Do they take readings every 30 second?
Who take readings every 30 second?
They take readings every 30 second, don't they?
Do they or we take readings every 30 second?
2.The professor's assistant always shows us experiments in the laboratory.
The professor's assistant doesn't show us experiments in the laboratory.
Does the professor's assistant always show us experiments in the laboratory?
The professor's assistant always shows us experiments in the laboratory, doesn't he?
Who always shows us experiments in the laboratory?
Does the professor's assistant or the professor always show us experiments in the laboratory?
3.My friend goes(обратите внимание!!!) somewhere in summer.
My friend doesn't go anywhere in summer.
Does my friend go anywhere in summer?
Does my friend go anywhere in summer or in winter?
Who goes anywhere in summer?