What about "I want him to let me tell what I think"?
Tell should be accepted!
"tell" is almost always followed by a person. "tell me", "tell him" except for things like "i'll never tell".
exactly the same as I put
What doesn't it says lascia? I surfix is for you and a is for him/her isn't it?
because it's the present subjective tense....so lascia becomes lasci