PAST TENSE.
Singular.Plural.
1. I had,1. We had,
2. Thou hadst,2. You had,
3. He had.3. They had.

SUBJUNCTIVE MODE.

PRESENT TENSE.
Singular.Plural.
1. (If) I have,1. (If) we have,
2. (If) thou have,2. (If) you have,
3. (If) he have.3. (If) they have.
PAST TENSE.
Singular.Plural.
1. (If) I had,1. (If) we had,
2. (If) thou had,2. (If) you had,
3. (If) he had.3. (If) they had.

IMPERATIVE MODE.

Singular.Plural.
Have (thou).Have (ye or you).
Infinitives.Participles.
(To) have,Imperfect—Having,
Having.Perfect—Had.

Have is used as an auxiliary with the perfect participle of a verb, to form the perfect tenses; as,

Present Perfect—I have written.

Past Perfect—I had written.