acabar de

To say you’ve “just done something” – use acabar + de. It’s used almost always in the past tense.
Using acabar without the de has the meaning, to end up.

Acabei de acordar. (I just woke up.)

Ela acabou de comer. (She just ate.)

acertar: to get right

It’s tough to find an English verb that matches this one! ACERTAR has the meaning of to get (it) right, to nail, to hit (it), to get it… ETC.

to get right, “nail it” acertar
I get it right eu acert o
you/he/she get(s) it right você/ele/ela acert a

Complete conjugation.

Ele não consegue acertar. He can't get it right.

Ele não conseguiu acertar. He couldn't get it right.

Você acertou tudo! You got it all right!

Podemos acertar tudo agora. We can get it all right now.

Relaxa irmã não tem como acertar. Relax sister, there's no way to get it right.

apresentar: to present

to introduce, present apresent
I introduce eu apresent o
you/he/she introduce(s) você/ele/ela apresent a

Complete conjugation.

Eu vou me apresentar. I'm going to introduce myself.

Vou apresentar o meu namorado. I'm going to introduce my boyfriend.

Ele se apresentou? He introduced himself.