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.

Question: Possible Duplicate: What is the difference between an expression and a phrase? Difference between "phrase" and "idiom" What is the difference between a phrase, an idiom and an expression? I am looking for the context where one is more appropriate than the rest. I've been using idiom and phrase more or less interchangeably. 
Answer: This question asks nearly the same thing. This is the difference between an idiom and a phrase: A phrase is "a small group of words standing together as a conceptual unit", while an idiom is "a group of words established by usage as having a meaning not deducible from those of the individual words". So, the difference is that an idiom as an established meaning not directly linked to the individual words. Any idiom is a phrase. As an example, "raining cats and dogs" is both an idiom and a phrase. "A herd of cats" is a phrase but not an idiom. Expression has about the same meaning as phrase, except it is usually used of a phrase which is in common use. So an idiom is a certain sort of expression, which in turn is a subset of phrase: idiom > expression > phrase.
yes

Question: So I thought I'm sure about this and my instincts say that: "If anyone has seen them .." would be right but then again when I said it like: "If anyone have seen them .." I started thinking which one would be the right one. Can you please guide me through which is the right one and why? P.S. English is not my first language. 
Answer: It's "if anyone has", because "anyone" functions as third person singular. It probably just seems right to use "have" because you would for any other number or person.
yes

Question: Persistence and perseverance seem to have very similar definitions. Googling shows persistence: Firm or obstinate continuance in a course of action in spite of difficulty or opposition. perseverance: Steadfastness in doing something despite difficulty or delay in achieving success. What is the difference between them? 
Answer: "Persistence" is used in the sense of "stubborn" (obstinate). There could be a slight negative connotation. For example: The telemarketers persistently called us. We don't say they "perseverantly" called us. "Persistent" is used when there continuing action, and the purpose is either bad, or neutral, and sometimes(rarely) good. "Perseverance", is used when the purpose is good. That is, you're doing something to help someone, or to achieve a desirable goal, such as climbing Mt. Everest. Depending on how you feel on something, you could use "perseverance"/"Persistence". For example, the telemarketer calling you, could annoy you, and you could call him "obstinately persistent". But to the marketer, you might be to him, a tough customer, and he might seem to himself "bravely perseverant in trying to persuade this tough customer." As you can see, it gives a different "feel" about the thing described.

yes