however

Used to introduce a statement that contrasts with what has just been said.

• The test was difficult; however, I passed.
  Sınav zordu; ancak geçtim.
• It was cold outside; however, we enjoyed the walk.
  Dışarısı soğuktu; yine de yürüyüşten keyif aldık.

To whatever degree; no matter how, used before an adjective, an adverb or much.

• However hard I try, I can't remember her name.
  Ne kadar uğraşırsam uğraşayım adını hatırlayamıyorum.
• We'll finish the job, however long it takes.
  Ne kadar sürerse sürsün işi bitireceğiz.

Used in questions to show surprise, with the meaning 'how'.

• However did you manage to carry all this alone?
  Bütün bunları tek başına taşımayı nasıl başardın?
• However did you find out about the surprise party?
  Sürpriz partiden nasıl haberin oldu?