Englishfor English speakers
knock
Noun
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A sound from something hard hitting wood.
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An impact.
knock
Verb
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When you knock on something, you hit your knuckles onto it repeatedly.
She knocked on my door three times before I opened it.
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When you knock something, you hit it, often accidentally.
test
Noun
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A test is writing that many learners do in a room at the same time so that people are able to see how much knowledge the learners have.
I'm happy because I got a high mark on the test.
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A test is something someone does to see if something works.
The person did a good test of the machine by pushing all the buttons and watching the machine.
test
Verb
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The action of testing; to try something out to see whether it works.
He tested the software many times.