ALLOW - PERMIT and LET
1. ALLOW and PERMIT 
These words have similar meanings and uses. Permit is more formal. Both words can be followed by object + infinitive
We do not allow / permit people to smoke in the kitchen.
When there is no personal object, an -ing form is used.
We do not allow / permit smoking in the kitchen
Passive structures are common; personal subjects and gerund (-ing form) subjects are both posible.
People are not allowed /permitted to smoke in the kitchen.
Smoking is not allowed/ permitted in the kitchen.
The passive structure with it is only possible with permit.
It is not permitted to smoke in the kitchen (But not it is not allowed to smoke ... )
Allow but not permit, can be used with adverb particles.
She wouldn't allow me in
Mary isn't allowed out at night.
2. LET
Let is least formal of these three words, and it is followed by object + infinitive without to. Compare:
Please allow me to buy you a drink. (polite and formal)
Let me buy you a drink. (friendly and inforamal)
Let is not usually used in the passive
I was not allowed to pay for the drinks ( NOT I wasn't let ...)
Let can be used with adverb particles; passive are possible in this case.
She wouldn't let me in.
I've been let down.
Trương Quốc Phú @ 20:52 20/09/2009
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