USE HAVE AND HAD CORRECTLY
Two tenses that are often confused are the present perfect (have + past participle) and
the past perfect (had +participle) these two tenses have completely different uses, and
you should understand how to differentiate them.
tense
Present perfect
Past perfect
form
Have + past
participle
Had + past
participle
meaning
Past up now
Before past up to
past
use
Not with a past
tense
Not with a present
tense