How to reject others politely?

If your leader ask you to overwork during this weekend, but you have an appointment with your family or your friends. How to reject him politely?

 

Please discuss about this topic in English, thank you!

I’m looking forward to your reply!

A bad experience about learning english I took an English Training Class recently, which is taught on line. I have took 2 classes, and I'm so disappointed with it, because I think I can't improve my English by taking these kind of class, In the class, I can't talk with the teacher , the most sentences I can hear are “well done”"that's good""move on", but it's not good really! What I want to learn is what's the meaning of this word, how to use this word, and when we will use it, and I want to talk about some stories, then the teacher can point out my mistake, and so on. Unfortunately, I can get nothing from this class, how can I do? I feel so bad, because I want to learn english well, but I can't find a right way to learn it....

What's the meaning of "I'll take it up there now." This sentence from '' Downton Abbey"

The summer is coming This summer, the rainy season is very short, it's just about one week in Suzhou, the hot weather has arrived before I could enjoy the rainy day. I can't live without air-condition now, really hope I can go other place to avoid the hot weather...

Please help me to translate a French sentences, it's urgent! Thank you! Do any body know the meaning of "DUT Génie Électrique et Informatique Industrielle Université Lille 1 Villeneuve d’Ascq",is taht a name of a University in France? I wanna know how to translate it in English, or in Chinese is better!

About me Hi, everyone! it's my first time to write in italki, i'd like to introduce myself to you. i'm a Chinese girl from Jiangsu, My English name is Vivian, or you can call me Wei2wei3 in Chinese, I come here to learn English, as i working in a foreign complany, but, i also want to make friends here, i'm interested in talking with people from diferent cuntury, know what kind of your culture, your life... by the way, if you want to learn Chinese, i'd like to help you, and I think that will be interesting~