when i use allow and let?
Please let me try to explain if I am allowed.
I think they are similar in that you would say, 'Please let me explain".
'Please allow me to explain'.
Although you would not say, 'Trespassing let' you would say 'Trespassing allowed/permitted.
I am allowed to go to the movie with my brother.
She let me go to the movie with my brother.
She gave me permission which allowed me to let my brother come with me.
Hope this helps?