поставьте предложения в вопросительную и отрицательную форму:
They take readings every 30 second
The professors assistant always shows us experiments in the laboratory
My friend go somewhere in summer
1.They take readings every 30 second.
They dont take readings every 30 second.
Do they take readings every 30 second?
Who take readings every 30 second?
They take readings every 30 second, dont they?
Do they or we take readings every 30 second?
2.The professors assistant always shows us experiments in the laboratory.
The professors assistant doesnt show us experiments in the laboratory.
Does the professors assistant always show us experiments in the laboratory?
The professors assistant always shows us experiments in the laboratory, doesnt he?
Who always shows us experiments in the laboratory?
Does the professors assistant or the professor always show us experiments in the laboratory?
3.My friend goes (обратите внимание!!!) somewhere in summer.
My friend doesnt 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?
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