question adverb like 为什么,什么时候，怎么，在哪里can only be placed at the beginning of the sentence or right after the subject. The difference is the part you stressed on. If you put it at the beginning, the stress is on reason, place, how ,where and so on. If you put it after the subject, the stress is on the subject. Hope it will be helpful to you.

这个要看情况吧。

SVO--except in poems and dreams

You mean what is the sentence structure in Chinese?呵呵:) chinese word order is very free.I think only correct way is imitate。

To phrase a question in Mandarin is surprisingly easy. In English, you have to convert the order of the subject and verb, and very often you have to put in an extra “helping verb (do/does)”, and after that you still have to conjugate the main/helping verb. None of the above is involved in Mandarin. In Mandarin, keep the same word order in questions as in declarative sentences, and go for one of the followings. For a Y/N question: a. Simply put a “ma” at the end of the question and raise the tone when you hit this “ma”. Therefore, “Are you John?” in Mandarin will be “You are John ma?” Or, b. Apply the verb to the “Verb not Verb” pattern, and the intonation will stay the same as in a declarative. To better understand the meaning of the pattern, you can add in mind an extra "or" to the front of the "not", as in the example below. The pattern is like offering two options for the listener to choose. But the speaker has to pay attention to his/her tone when using this pattern. If he/she doesn't sound upbeat enough, he/she will be considered impolite/impatient. E: “Are you John?” → M: “You are (or) not are John?” Or, c. Simply say the question with the tone raised at the end. Something like this happens in English as well, which shows surpirse or doubt at a high level. E: “You are John?” → M: “You are John?” For a wh- question: a. Keep the same word order as in a declarative and simply replace the unknown part with a proper wh- word. This happens in English too. The difference is that it's not the most common way to form a question in English but it is in Mandarin. E: “Who are you?” → M: “You are who?” b. If you want to show a higher level of curiosity/confusion, you can go on and add a “ne” or “a” to the end (the latter shows strongest curiosity/confusion). E: “Who are you?” → M: “You are who ne?” or “You are who a?”