As someone who speaks English. I could certainly say "Gloria, study one hour more." This should not be marked wrong.
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why is it estudia when it seems to be a command, does it not then become estudie ?
We are using the imperative tú form, so estudias becomes estudia
It should be "Gloria, study one hour more"
It can be, but the given answer is still correct.
As above, poor English interpretation.
No, the given answer is not poor English. It is one of many correct answers.