@englishwithevelyn: A1 – but: I was tired, but I went to work. A2 – although: Although I was tired, I went to work. B1 – even though: Even though I was tired, I went to work. B2 – however: I was tired. However, I went to work. C1 – nevertheless: I was tired; nevertheless, I went to work. C2 – albeit: I went to work, albeit tired.