[Grammar] There are 7 days in a week.

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Yoshio

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Would someone check the below sentences, and tell me whether or not they are grammatically OK?

There are 7 days in a week.
A week has 7 days.
7 days is a week.

A week is 7 days.
7 days are a week.

Thank you in advance,

Yoshio
 

5jj

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The first two are fine.
 

emsr2d2

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Additionally, I would accept "A week is seven days" although it is not as natural as the first two.
 

dut_thinker

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Seven days constitute a week.
 

Yoshio

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Thank you all for useful information.
So the following two are not right.

Seven days is a week.
Seven days are a week.

Thank you again for your help. I really appreciate it.
 
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