The children WERE cooped UP all day... or The children has been cooped UP all day... "Cooped up" goes together - one does not "coop" as a verb.
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Grammar GeekThe children WERE cooped UP all day... orI guess you mean "the children have been cooped all day" ?
The children has been cooped UP all day...
"Cooped up" goes together - one does not "coop" as a verb.
Although one can apparently invigilate.