If you plan to ask a guy to the dance directly, it might make you feel a little more confident if you internally go over what you plan to say a few times before you actually ask. That way, you won't have to worry about what the right words should be; you only need to worry about the act of saying them. On the other hand, you do not want to sound as though you are reading from a script. Get a general idea of what to say and how to say it, but ad-lib as needed and prepare yourself for unexpected questions or responses. Asking loudly in the middle of lunch with all of his friends and the entire cafeteria watching might not be the best idea, especially if you're not sure about his response. The best time to ask him is toward the end of the school day, during a moment in which you can pull him off to the side and ask him discreetly. Avoid asking him at the beginning of a shared class or school day. If he turns your invitation down, the rest of the time you spend around him that day can feel awkward. Keep in mind that there might be another girl who has already asked him to the dance, or that he might have other plans that day that would prevent him from going. Asking about whether he plans to go or not can save you some embarrassment.  If he says that he's going with someone else, that should give you your answer without you needing to ask the question. If he says that he's not going, find out why. He might be busy and unable to go, which rules him out as an option. If he just hasn't been asked, though, you have your chance. If you get the green light, directly ask him, “Would you go to the Sadie Hawkins Dance with me?” Look him in the eye and smile as you ask. Your body language should be confident and friendly. If his answer is yes, you can show your excitement, but try not to get too crazy about it. If his answer is no, smile, stay calm, and walk away with your head held high—after all, at least you were brave enough to ask. If you do get rejected and feel like you might get teary-eyed, excuse yourself politely...

How would you rephrase that briefly using Chinese?
在你邀请之前排练一下，如果你打算直接邀请别人跳舞，事前自己演练几次会让你更有自信。 寻找恰当的时间和地点。 问他是否要参加舞会。 问他是否愿意跟你一起去。 优雅地回应他的反应。