Cara present perfect and simple past

Present Perfect:
Subject + Has/ Have + Verb 3 (Past participle)

Simple Past:
Subject + Verb 2 / -ed

cara mengetahui suatu kalimat tersebut present perfect atau simple past adalah dengan mengidentifikasi keterangan waktunya.

present perfect biasanya menggunakan for dan since sebagai keterangan waktunya.
sedangkan simple past dengan yesterday, ago.

contoh :
present perfect
She has studied for two hours.
they have built that house since 2015.

simple past
she studied two hours ago.
they built that house last year.