1. Use the indirect method. Instead of saying “I can’t do this”, you can say “I am busy today”.

不要太直接。與其說“我做不到”不如說“我今天很忙”。

2. Dislocate yourself. Don’t say "I can’t eat this", just say "My big brother says it is harmful for health etc.

不要提你自己。別說“我不吃這個”，要說“我哥哥說吃這個對身體不好”之類的。

3. Handle it with tact. Example: "I love flowers, when I will be free I would definitely bring them. But I can’t bring them right now."

說話要圓滑。比如：“我挺喜歡花的，如果有時間的話，我肯定會帶一點回去。但是現在恐怕不方便。”

4. Be quiet. Sometimes only becoming quiet is enough. People will know that you are not going to do what they have asked you to do.

沉默。有時候沉默就足夠了。別人能夠從你的沉默中知道你不會去他們要你做的那件事情。

5. Just speak up. People would feel annoyed but later they would realize your position.

直接說出來。剛被你直接拒絕的時候，別人也許會覺得不爽，但是過一會兒他們就會了解你的立場。