correct this

You should have let me ate it.

you should to leave me to eat it…..i think this is corect or…..you have to leave me to eat it or in pass…you had to let me to ate it. 

you should've let me eat it :P

let me eat it

i want to say you I am sorry for my mistakes

you should let me eat it !~ without "have" i think <<- the one who suffering from grammer trying to do something here LOOOL

lol I agree with you that we're all "suffering from grammer"; and that we're also struggling in trying to get our spellings right every time. (Oh, it's grammar, not grammer)

The main point is not only to use English as often as we can, but also to try and correct ourselves whenever possible.

I agree with freedom-soul

You should let me eat it

That's a nice cake you have bought, you should let me eat it!

That was a nice cake you bought yesterday, you should have allowed me to (OR let me) eat it.

I think you're right ash_ton – the use of "to" in …let me to eat it is not acceptable,  We normally say ...let me eat it or …allowed me to eat it.