Hi 秉奇, (1) We use the preposition "of" to indicate part of a whole. The first step (being prepared) is a part of delivering an impressive speech. Therefore, we should write: Being prepared is the first step of any impressive speech. Reference: http://www.macmillandictionary.com/dictionary/british/of_1 (definition 6) (2) "any speech" is more natural here as it has the meaning of "no matter which impressive speech you are considering". (3) I presume that you are speaking to an audience, and they would likely have more than one question. Therefore, it sounds more natural to ask if they have any "questions". Hope this helps. Cheers, Lance

1) "Being prepared is the first step in making/giving/delivering an impressive speech." 2) 'Speech' can be countable if it's a talk, especially a formal one about a particular subject. But it's uncountable when it means the ability to speak, or a spoken language, or the particular way in which someone speaks. For example: "In speech we use a smaller vocabulary than in writing." (NOT IN SPEECHES!) 3) You could say that but it still sounds better in plural.

1) Of is correct 2) "Speech" is best, "speeches" is incorrect in this context 3) "Questions" is the correct way