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Answering the question, the student used the following:

'When the water vapor goes high, the cooler air causes water drops to stick to particles of dust or ice. These things are what makes clouds visible.'

Is it grammatically correct? And does it sound OK for a native speaker?

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  • By "goes high" do you mean "rises" or "is more concentrated"? This is why clouds appear or This is how clouds are formed.
    – Weather Vane
    Sep 9, 2021 at 14:28
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    You could argue that the phrase These things are what regarded as a process or package could take the singular makes. Regarded as discrete actions, they would take the plural make. I think that a native speaker might well use either construction without attracting attention.
    – Ronald Sole
    Sep 9, 2021 at 14:30

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