Also it should be the right place where they will not be able to remember anything that will stress them out and will reject.  Find a time when your parents seem relaxed and happy to have the discussion. It is not a good idea to ask for something when either parent seems stressed or tired, because they might get annoyed easy. Usually, family dinner time is a safe bet.  That being said, if mom or dad seemed stress, that could work in your favor if you're asking for a pet. You could point out that people who are attached to a dog or other pet have significantly lower stress levels, blood pressure, and a decreased risk of depression.  If you haven't completed something they've asked of you, such as chores or homework, this is not the right time to ask either. It's another easy (and valid) reason for objection, so get those chores done first. If you whine or get angry, your parents will likely think you are not mature enough to handle whatever it is you are asking them for. They'll shut down the conversation immediately, insisting that you all talk about it when you're feeling calmer. That or they'll argue that your tone proves that you're not ready. Both are situations you want to avoid! Even if you end up not getting your way, behaving maturely throughout will set the tone for future discussions that may go your way. It may leave them thinking, "Huh, maybe our child really is growing up and becoming mature." You want to leave them wondering if they should've said yes, so when you bring the topic up later, they're warmer to it. Many times parents say it's because it's somehow an inconvenience for them. Either it costs them money or time or both. Because you are likely asking for them to do something for you, emphasize that it could also benefit them. Both of you get something out of the situation, so why not?  If you're asking for a phone, make it clear that they can use your new number to check up on you. You could even be willing to talk about what happens if you don't answer – maybe you'd get your phone...

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Write a summary of the previous text in Chinese:
选择好时机提出请求。 在谈话的时候保持冷静。 让父母知道这件事对他们自己也有利。 给他们时间考虑。 作出让步。 写出你的理由。