The following are discussed relative to Present Perfect and Past Simple in use between to friends will be able to clearly distinguish.
1. An activity which started in the past and continues up to the present with an activity which started and finished in the past
For example,
1. I have lived in Bangkok for ten years.
2. I lived in Bangkok for 10 years.
Described in sentence 1 are discussed actions that began in the past and continue until the present due 10 years ago. Now, it is still not yet move to the Present Perfect section, in the sentence that is said to act at the beginning and the end to in the past. Now moved to another location, and then use the Past Simple.
2. The result of a past action that is connected to the present
For example,
1. I have lost my wallet.
2. I lost my wallet, but I have got it back now.
In the sentence I mentioned the consequences of actions that have occurred in the past and still in effect due to current use of Present Perfect section, in the second sentence mentions in the past and now have returned, and then use the Past Simple.
3. To announce news with to give details of the news
For example,
1. Someone has stolen my bike.
2. I left the bike outside the Saveland Department Store for a few minutes and when I came back, it wasn't there.
Describe in one sentence, 1 woman says "someone of her bike to theft." She has not returned, so use the Present Perfect bike, best in the second sentence the woman to the police that she was detailed to the Bike Park, the Mall safe land. The secret came out, it was found that wraps the bike has gone, then use the Past Simple.
4. An action in the past up to the present with an indefinite time with an action in the past with a definite time
For example,
1. I have started taking driving lessons recently.
2. I started taking driving lessons a week ago.
Described in sentence 1, the term recently translated as "recently". Of course, time is not specified when using the Present Perfect, which is what other words that do not specify the exact time that this, as well as the use of tense recently, never ever, lately, namely: already, yet is used as a sentence adverb placed into question or reject the word 2nd part in the sentence a week ago, identified by a certain time, and then use the Past Simple in other words. Of course, that use this same tense: yesterday, last week ago, last month, last year, etc.
5. The periods of time of that action are not finished with the periods of time of that action are finished
For example,
1. I have seen Peter this morning.
2. I saw Peter this morning.
In the case of both the opening sentence might be a Perfect Present or Past Simple. Normally, if you know for sure that the time is right to come up as the Present Perfect, but if you ask whether to use Simple Past? The answer is by, like in case of sentence 2, this requires a time interval.
It Present Perfect is used to display the action is continuous and Past Simple is used to display the action has ended.