Yes that's correct.
Subject + Had + Past Participle
For example:
I had danced.
The past perfect tense is formed with have+past participle.
There is no past perfect tense of sat. Sat is the past tense and past participle of sit.There is a past perfect of sit.Past perfect is formed with had + past participle. The past participle of sit is sat. So the past perfect of sit is: -- had sat.eg We had sat in the car all day.
"Had left" is the past perfect tense of leave.
The past perfect is formed by had + past participle. The past participle of serve is served.past perfect = had served.They had served lunch by the time I got there.
The past perfect tense of send is had sent.
The past perfect tense of "assist" is "had assisted." It is formed by combining the auxiliary verb "had" with the past participle form of "assist."
I had studied.The past perfect is formed with - havd +past participle.The past participle of study is studied
The past perfect tense of sip is had sipped.
No they are not the same but the past perfect tense uses the past participle.
* infinitive:drive * past: drove* past participle: driven Past Perfect is formed like this: had + past participlePast Perfect: had driven
The future perfect is formed with - will + have + past participle. The past participle of have is had.The verb phrase is -- will have had.eg They will have had their breakfast by 10:00am
* infinitive: know * past: knew * past participle: knownPast Perfect is formed like this: had + past participlePast Perfect: had known