One easy way to know if you should use the Present Perfect or the Past Simple is by looking at adverbs of time. We can call them keywords (KW).
Some time words are specific and concrete, which means you can easily find them on a calender, clock, etc. They go with the Past Simple.
Other adverbs of time are less specific, which means it is hard to say exactly what time they refer to. This non-specific time in the past means that the results of this situation/action in the past is important now or still present now. This means they go with the Present Perfect.
Take our little quiz and see if you can begin to feel the difference between specific (Past Simple) and non-specific (Present Simple) time.
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