What is the imperative of работя? Singular and plural forms, please.

Translation of, "Те дали имат нещо против?" I found this sentence on a video without a translation. Using a translation tool, I get, "Do they mind?" when the question mark is included, as it was on the video text, and "They do not mind.", if the question mark is omitted. I understand how the sentence is formed, but does дали mean that ли is not used when asking a question, and are both translations correct?

¿"desde diciembre hacia febrero" y "de diciembre a febrero" son los mismos?

Той има двама сина. Why двама rather than два? I wanted to translate "He has two sons." Both translators give me the above sentence,I've now found the answer in Wikipedia: "Furthermore, cardinal numerals take special endings when: referring to men (2-6 and 10, and 20-100) - add "-ma" e.g. 2 chairs - dva stola; 2 brothers - dvama bratya"

What's the best free online Bulgarian English dictionary? From what I have found so far, Google Translate seems as good as any. Actually I don't mind paying a little or downloading something, but I want something I can use on my computer rather than a book.Тhe biggest problem I am finding is to know where to stress a word.I may have answered my own question as I've found that dict.com shows the stressed vowel.

Is this sentence correct: "Ти ли си негов нриятел?"? I got this question from a video course. However, in all the other examples of affirmative questions the verb moved to the end of the sentence. So shouldn't the question be: "Ти негов приятел ли си?"? Sorry, I typed нриятел in the question, when I meant приятел (friend). I don't see any way to edit the title or delete (and repost) the question.

Is "hasta semana" correct informal Spanish for "see you next week? Or would you say something more elaborate such as, "hasta la próxima semana"?

¿Come se dice "What do you call a man who speaks two languages?" en español?