REUSE Everything

American and British English

Both are correct. They're only different ways of saying the same things. Use the one you find easier.

Question Words

They are also named Interrogative Pronouns and WH-Questions. 

If they're placed as the first word of a sentence, it means you have a question - but 

yes, there are some exceptions. 

(Também são chamadas de Pronomes Interrogativos e Perguntas com WH. 

Se forem a primeira palavra de uma frase, significa que esta frase é uma pergunta - mas 

sim, há algumas exceções.).