please tell me if we can say 'If allowed...'

[duc]

Please read the sentence below first:
If allowed enough time,I would have finished my test.
Can we say ''if ALLOWED'' or we have to say ''if I HAD BEEN ALLOWED''
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Don't see your shade think you are great

[Mister Micawber]

.
You can say 'if allowed' as long as the subject is the same as the subject of the main clause (here, 'I').
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber