Past simple refers to an action that happened in the recent or distant past that no longer applies to the present. (E.g., "he walked home yesterday." "Columbus discovered America in 1492.") Present perfect uses a combination of "to have" + the past participle of the verb. (I have been to France. He has embarked on a journey of self-discovery.) This is a somewhat confusing tense to non-native English speakers. It denotes the concept of "unspecified time," with four major themes: (1) Experience. (I have never eaten caviar before. I have seen that movie three times.) (2) Change over time. (You have grown since I last saw you. He has learned French since he was in grade school). (3) Accomplishments. (Man has climbed Mt. Everest. Man has walked on the moon). (4) Uncompleted Action. (I have not finished my homework yet. I have not finished my lunch.) (5) Repeated action. (He has seen the doctor three times. The army has attacked the city five times). Present perfect continuous. "To have" + "been" + "present progressive" (e.g, I have been walking). This denotes an action that started in the past and continues to this day. (I have been learning Spanish for three years. She has been dating Bill since last spring). I hope this helps.

Past simple is an event that happened: (He walked.) Present Perfect attaches "have"/"has" to the past tense of the verb: (He has walked.) Present Perfect Continuous (also known as Present Perfect Progressive) attaches a form of "be" to the Present Perfect: (He has been walking.) Hope this helped a little! :)

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as i know,simple past is used for exact time in the past but when u use present perfect u don`t know the exact time and it`s abt somthing did in the past and now is finished..