Debería habérselo dicho

[ROBINDESBOIS]

I should have told him
I must have told him
Is the second sentence OK?

[chileno]

I should have told him/her:good:
I must have told him
Is the second sentence OK?


I must have told him = debo de habérselo/haberle dicho

[wrholt]

Both sentences are good, but they mean different things.

"I should have told him/her" states that there was an obligation to tell him/her, but it it uncertain whether you actually told him/her or did not tell him/her.

"I must have told him/her" states the believe that I told him/her already.