The Present Tense: HAS or HAVE?
Quite simply, for the verb TO HAVE, there are two conjugations: HAS and HAVE. Notice that the third person singular is the only subject that takes on HAS
Singular Plural
I HAVE We HAVE
You HAVE You HAVE
He HAS They HAVE
She HAS
It (my dog) HAS
The Past Tense: HAD...
What makes English so easy is the fact that its past tenses are all the same. The past tense of HAVE is always HAD, so it makes it super easy to remember.
Singular Plural
I HAD We HAD
You HAD You HAD
He HAD They HAD
She HAD
It (my dog) HAD
Okay, that's easy, but what about the PRESENT PERFECT?
The present perfect is used to express past happenings that continue to the present or relate to the present. It always takes on an auxiliary verb TO HAVE plus the past participle. Let's take a look using the verb TO SEE. To understand when and why we use the present perfect, click here on another post.
Singular Plural
I HAVE SEEN We HAVE SEEN
You HAVE SEEN You HAVE SEEN
He HAS SEEN They HAVE SEEN
She HAS SEEN
It (the dog) HAS SEEN
Notice here that again, the 3rd person singular takes on the verb conjugation HAS.
And what about the PAST PERFECT?
Once again, the past perfect is easy because the auxiliary verb does not change. It is always HAD + the past participle. Let's take a look using the verb TO BE in the past participle:
Singular Plural
I HAD GONE We HAD GONE
You HAD GONE You HAD GONE
He HAD GONE They HAD GONE
She HAD GONE
It (my dog) HAD GONE