Let's first talk about the following two sentences:
1- Sara went to bed as soon as she had finished homework.
2- Sara went to bed as soon as she finished homework.
I think your confusion is valid because we use the past perfect when we talk about something that took place before another thing in the past. So the use of the past perfect comes across in the first sentence but the use of the past simple in the second sentence doesn't. Am I right? In fact, we don't need to use the past perfect unless it is necessary or unavoidable to do so. Even if we talk about one action happening before the other one, it is possible to use the simple past for both actions if we think it is not necessary to highlight or emphasize the happening of the earlier action. It sounds natural to avoid using the past perfect where the simple past works, which is used to refer to something or several things happening in sequence (one after another) in the past.
So both of the sentences are grammatically correct. However, I'll prefer the second phrase to the first one.
As for the last two sentences, it is correct to say that "everyone had gone home when Sara got to the party", but it's not grammatically correct to say that "everyone had gone home when Sara had got to the party". It doesn't make sense. In the past perfect when we talk about two events, we use the simple past in one clause and the past perfect in the second clause.
Let's now talk about the following sentence you are confused about:
"Everyone went home when Sara had got to the party".
There is nothing wrong with this sentence, but the meaning is other way round. It means that first Sara got to the party and then every one went home. Look at the
first sentence again. When Sara got to the party, everyone had gone home. Here it means that first everyone went home and then Sara got to the party. Sometimes, one action happens soon after the other action, here we should use the past simple in both clauses such as when Sara got to the party, everyone left, when they saw the police, they ran away, etc.
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EDF had expected to build the £18bn plant
In this case, "expected" is the past participle (on regular verbs, past participles are identical in form to the past tense) of the verb expect, so the past perfect with the had is still there!
Best Answer
"He went home. But before that he had eaten a sandwich." - the most technically correct answer - you use past perfect tense in its intended purpose.
"He went home. But before that he *has been eating a sandwich." - incorrect by the grammar rules, and I don't think present perfect continuous tense is very common in casual speech in this case. I'd use past perfect continuous ("...he had been eating a sandwich").
"I lay in my bed and remembered the last dream I *had have." - I think the tense is right (past perfect again), but you got the past participle wrong - it should be "...I had had".
"I lay in my bed and remembered the last dream I *have had." - see the second case.
In general, it's also acceptable to use Simple Past in place of Past Perfect if the order of the events is clear - so "He went home. But before that, he ate a sandwich" and "I lay in my bed and remembered the last dream I had" would also be correct.