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• There are two kind of questions.
  • Yes or no questions.
  • Questions that has a question word (5W + 1H).

• In English here is a simple w - question structure likes.
  • question_word + verb + subject + maybe_verb + the_rest_of_the_sentence?
• However not all verbs are all equal in English. There are modal verbs like can, must, shall. And there is also auxiliary verb like to have, to be, will.

• Example in German.
  • Heute lese ich ein Buch.
  • Wann lese ich ein Buch?
  • Today I read a book.
  • When I read a book

• "Was kannst du machen?" means "What can you do?".
• "Was hast du gemacht?" means "What have you done?".

• These are the safest patterns.
  • subject + verb + adjective_or_adverb.
  • question_word + verb + subject + adjective_or_adverb?
• This is a wrong pattern.
  • question_word + do + subject + verb + adjective_or_adverb?

• "Wann" means "when".
• Examples.
  • "Wann kommst du nach Hause?" means "When are you going to come home?".
  • "Wann fahrt der Bus?" mean "What time does the bus go?" or "When the bus go?".

• "What time?" is never a proper way to ask for time in German language.
• So for asking time always use "wann".

• "Bis" means "until when".
• "Seit" means "since when".
• Examples usage of "bis" and "seit".
  • "Bis wann musst du arbeiten?" means "Until when you have to work?".
  • "Seit wann wohnst du hier?" means "Since when have you been living here?".

• There is also a word called "wenn" which is a combination of "when" and "if".
• However this is not a question word. So, never use this for asking question.

• "Wo" means "where".
• Examples.
  • "Wo ist die Bushaltestelle?" means "Where is the bus stop?".
  • "Wo hast du deine Hose gekauft?" means "Where did you buy your pants?".
  • "Wo ist der nachtste Starbucks?" means "Where is the next Starbucks?".

• There are "woher and "wohin" as well.
• In German language places is separated into these.
  • Place to go there.
  • Place to be there.
  • Place to come from there.

• For example "Where is your house?" means a place to be there.
• Whereas "Where are you going?" means a place to go there.

• "Wohin" always indicates that we are talking about destination.
• Whereas "woher" always indicates that we are talking about the origin.
• "Wo" indicates a place, static place.

• Examples.
  • "Wohin gehst du?" means "Where are you going (to)?".
  • "Wohin fahrt dieser Bus?" means "Where is this bus going?".

• In contrast asking "Wo fahrt dieser bus?" means "Where is this bus located?" the answer could be "The bus is located at the bus station.".

• Examples with "woher".
  • "Woher komst du?" means "Where do you come from?".
  • "Woher kennst du ihn?" means "Where do you know him from?".

• Examples of the flexibility of using "wo".
  • "Woher komst du?" can be asked with "Wo komst du her?".
  • "Wohin gehst du?" can be asked with "Wo gehst du hin?".

• To sum up.
  • "Wo" is used to ask for at what location.
  • "Wohin" is used to ask to what location.
  • "Woher" is used to ask from what location.

• "Was" means "what".
• Examples.
  • "Was willst du essen?" means "What do you want to eat?".
  • "Was ist deine Lieblingfarbe?" means "What is your favorite color?".
• Random sentence, "Die Wolfe in Twilight sind der beste Special Effekt aller Zeiten." means "The wolves in Twilight is the best special effect ever."

• Alright! There are these things about "was".
• For some reason German is really like to use "wo".
  • Instead of "von was" they said "wovon".
  • Instead of "mit was" they said "womit".
  • There are other "wo" as well for "von", "mit", "nach", "um".
• In this guide it says that all of these variants are all the same.
• Example of sentence without the translations.
  • Wovon hast du letzte Nacht getraumt?
  • Worauf freust du dich?
  • Woran denkst du?

• In English "what"can have a lot of preposition. These are some examples.
  • What did you dream of last night?
  • What are you looking forward to?
  • What are you thinking about?

• In German the preposition is in the beginning of the sentence. These below are some example of the English sentences with the German sentence structure.
  • Of what did you dream last night?
  • To what are you looking forward?
• Hence, it is translated like these in German.
  • Wovon hast du letzte Nacht getraumt?
  • Worauf freust du dich?
  • Woran denkst fu?

• "Wer" means "who".
• Examples.
  • "Wer ist dein Lieblingsschauspieler?" means "Who is your favorite actor?".
  • "Wer will ein Bier?" means "Who wants a beer?".

• "Worauf freust du dich?" means "What are you looking forward to?".

• "Whom" translates into "wem" or "wen".
• "Whose" translates into "wessen".
• If you want to know who did/does/is something then use "wer".
• When you are using "wer" always put the preposition in the front of it.
  • In English the structure is like this whom + from_or_of_or_to_or_with?
  • In German the structure is like this zu_oder_von_oder_fur_oder_mit + wem_oder_wen?

• "Warum" means "why".
• Examples.
  • "Warum lernst du Deutsch?" means "Why are you learning German?".
  • "Warum hast du mich nicht angerufen?" means "Why did not you call me?".

• There are three synonym of "warum", which are these.
  • "Weshalb".
  • "Weswegen".
  • "Wieso".
• There are difference at all from all those words. So I might as well stick with "warum".

• "Wie" means "how".
• Examples.
  • "Wie gehts dir?" means "How are you?".
  • "Wie komme ich von hier zur Superstrasse?" means "How can I get to super street from here?".
  • "Wie grosse bist du?" means "How tall are you?".

• Examples.
  • "Wie lange dauert es, Deutsch zu lernen?" means "How long does it takes to learn German?".
  • "Wie viel kostet das?" means "How much is that?".

• "Wie" is also a word to make a comparison.
• For examples.
  • "Ich bin genauso gross wie du." means "I am exactly as tall as you.".
  • "Die Suppe riecht ein bisschen wie Bier." means "The soup smells a little like beer.".

• There are also "wieso" which means "how so".

• "Welche" means "which".
• This word has a lot of forms like these.
  • "Welche".
  • "Welchem".
  • "Welchen".
  • "Welcher".
  • "Welches".
• The form is depending on how the subject is singular or not.
• And I guess also depending on whether the subject is countable or not.

• But for all "welche" is just fine and correct.

• Examples.
  • "Welche Sprachen kannst du sprechen?" means "Which languages can you speak?".
  • "Welches Bier wollen wir zuerst trinken?" means "Which beer should we drink first?".

• "Welche"/"welchem"/"welchen"/"welches" can be used as well as pronoun. Here are some examples.
  • "I saw a movie last night", "Which one?".
  • "Ich hab gestern abend einen Film gesehen.", "Welchen?".

• There is nothing called "welche eine"/"which one" in German.

• There is a possibility for "welche" to be used as it is "das", "der", or "die".
• But for safety it is recommended to only use "welche" for asking question.
• Full article can be found in here, https://yourdailygerman.com/2013/06/04/german-question-words/.
• Full screenshot.