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.

Example Input: Question: What's the difference between these two phrases?
Answer: To add to Martha's answer: The simple past ("Did you see this") refers about an event in the past The present perfect ("Have you seen this") suggests a link with the present time. If "this" is something you could have seen but cannot anymore (you should have been there seeing "this" at the time, but it wouldn't have the same impact if you see it again now), then "Did you see" is more appropriate. It is about an event that happened once in the past. If "this" is something you can check out whenever you want, "Have you seen" is more to the point, because it suggests that, if you haven't seen it in the past, you could consider seeing it now or in the near future. It is about an event which can happen again or is still relevant in the present.
Example Output: yes

Example 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.
Example Output: no

Example Input: Question: Is the following correct, or is there more to it? "I forgot his name" I knew his name, but I forgot it. "I forget his name" I keep forgetting his name. Where using "forget" basically means that you tried to remember this information before as well, but you couldn't then either.
Answer: I forgot his name means I've permanently forgotten, while I forget his name means I've temporarily forgotten even though I expect to be able to remember. In a few more minutes I'll probably remember. See also the phrases "slipped my mind" or "the tip of my tongue".
Example Output:
no