EXPLANATION ABOUT PRESENT PERFECT AND PAST SIMPLE

1. Simple past tense is a form of past tense in English. The sentence is used to describe a time in the past (past). The function of the simple past tense is to describe an event or action that has occurred, whatever describes an event that has ended in the past.

1.1. PAST SIMPLE Specific times in the past yesterday, five minutes ago, in 2000, the other day, last month Examples: I went to the park yesterday. I studied in China in 2010.

2. In the simple past tense, the adverb of time used is the specific past. ... This is different from the present perfect tense, which does not use specific past tenses because it is in the present tense. But it is still possible to use the past time in the same period.

3. Present Perfect Tense is a form of verb that expresses a situation or action that started in the past and is related to the present. It may be that the situation or action has now been completed or is still happening.

3.1. PRESENT PERFECT Vague times in the past ever/never, not yet, already, so far, to date, till now, up to the present Examples: I've never gone to the park. I haven't been to China yet.