Learn English – Difference between “He had taken a photo of me” and “He had been taking a photo of me”

This is a tricky question. The native ear will immediately recognize that "had been remained" is not correct. The had should be followed by a past participle. Remained and been are both past participles; you can use one or the other, but not both.

So, either of these could be used to start the sentence:

• He had been president for 20 years...
• He had remained president for 20 years...

This issue gets tricky, however, when you switch to the passive voice. In that case, you can use he had been followed by a past participle, as in:

• He had been elected 20 years ago...

That's a valid formation, and it's listed as the past perfect passive verb form in this table¹:

So, the question becomes, why can the verb elected be used in this way, but not the verb remained?

The key is that the sentence with elected is using the passive construction, but the sentence with remained has an active construction. As Dave Sperling says on his ESL website:

Because subjects of passive verbs receive the action, verbs that cannot have objects (intransitive verbs) do not have passive forms.

If you look up the words in a dictionary, you'll see that elect is transitive, and remain is intransitive, which is why had been remained sounds so awkward to the native ear, while had been elected sounds just fine – although many native speakers might have a hard time explaining why.

Now, you can explain it for them: "It's because remained is an intransitive verb, so it cannot be used in the passive voice."

We don't need the preposition "by" in a passive construction.

Tens of thousands were killed during the civil war.

The tense differences, were killed, had been killed, express a time relationship: the past perfect refers to a time that is earlier than another time also in the past:

Tens of thousands were killed during the civil war.

Tens of thousands had been killed before peace talks began.