in the mail. so all we need to do is place the main verb (“receive”) in past tense. we don’t need to add “had” or any other helping verb to the sentence.
up until now, the use of “had” before the main verb in a sentence may have seemed arbitrary. but now you know that there’s a simple rule that tells us when to use “had” and when to leave it out. are you talking about two events in the past and one took place before the other? use “had” to describe the first event. are you keeping things simple and just talking about one event in the past? keep “had” 