Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: Possible Duplicate: "Did it close" vs "Has it closed"? As a English non-native speaker it is difficult for me to understand when I must use present perfect or past simple because in my official language there isn't the present perfect tense. I know that present perfect is related to something that happened in the past but its result is important now. But for instance: The message has been sent. The message was sent. Please help me point me out any examples/contexts where I should use 1. instead of 2. 
Answer: Think of the past tense as referring to an event that took place at a particular time in the past. In saying The message was sent, the speaker will normally have in mind something like yesterday or last week. The present perfect is called 'present' for a reason. The speaker is talking about the situation now, a situation in which a past event has some bearing on the present. For example, The message has been sent might be followed by a comment such as so it's too late to do anything about it now.

no