Past perfect tense.

You had solved all the sums before the bell rang.

In one type of past perfect tense there are double sentence, like above sentence and in second type of past perfect sentences adverb is used and the sentence is single.

But,
can I say this sentence a past perfect?

The farmed had ploughed in the field before sowing the seeds.

In the first half “had” was used, but why in the second half sow+ing was used?
Also
His health had broken down before retirement.
Why in the second half simple past tense was not used and retirement was used?

Can I say this sentence a past perfect sentence?

When you knocked at he door, I was not at home.

Thank you.

Hi Rida,

We can use the past perfect for an earlier time either with a past simple being present or if there is an adverb (or adverb phrase) of time that indicates a past time.

Alan

Hi Alan,

Thank you, but will you please explain a little bit? I couldn’t understand fully.

Thank you.

Hi,

What I meant was that you could say: I had visited the castle previously (using just the adverb of time) or I had visited the castle before I came home (using the past simple).

Alan

Thank you, Alan.
I have another question.It is also relater to past perfect tense.

1-Had you revised the paper before the bell rang?
2-Had you revised the paper before ringing the bell?
3-Had you revised the paper before rang the bell?

Which one is correct and why? Is my second sentence also correct?

Thank you.

Hi Rida,

(Related to the past perfect)

In these questions I would accept: Did you revise (past simple) the paper before the bell rang/before ringing the bell? (3) Has the wrong word order. The past perfect of course would also work.

Alan