What is the use of sent and send

sent is the past tense of send

The conjugations are:

Verb: to send

I send
you send
he sends
we send
you send
they send

sent is the past tense

I sent
you sent
he sent
we sent
you sent
they sent

and the participle

I have sent
you hvae sent
he has sent
we have sent
you have sent
they have sent