What is the difference between past participle and past perfect?

Answer 1

A past participle ends in -ed or -en and it has two functions:

1) adjective

EX: This car is heated. (Verb: "is"; Adjective "heated")

EX: We had a heated argument. (Adjective "heated")

As an adjective, the past participle occurs after the verb BE (is, am, was, were, been) or it

modifies a noun.

2) part of a verb

EX: The stove has heated the room. (Verb: "has"; Part of a verb: "heated")

As a part of a verb, the past participle occurs with the verb HAVE (have, has, had).

Past tense refers to a verb. (Please note that, past participles are not verbs.)

EX: The stove heated the room.

In the example above, the word 'heated' doesn't do the following things:

It doesn't occur with BE (is, am, was, were, been)

It doesn't occur with HAVE (have, has, have)

It doesn't modify a noun (argument)

"heated" functions all by itself. It's a verb, and the -ed ending tells us it's a past tense

Answer 2

The past participle is a nonfinite verb form used in various verb tenses. The past perfect is a tense that expresses an action that happened before another action in the past. In English, the past participle is often used in the formation of the past perfect tense.