verb
1
BAD : They also allow to the prisoners to keep birds.
GOOD : They also allow the prisoners to keep birds.
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allow sb to do sth (NOT to sb ): 'The principal doesn't allow them to wear jewelry to school.'
2
BAD : It's not allowed to talk in the library.
GOOD : You aren't allowed to talk in the library.
GOOD : Talking in the library isn't allowed.
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It is not usually used as a preparatory subject before (not) allowed , especially in spoken English.