how to use 到 , 起来, 上, 上不了 Hi all i have some questions... plz answer me :-) Q1. 他在会议上发了言. what is 上 used for in the sentence? Q2. 人到中年容易发胖. Does dao mean "become" or something like this? Q3. 头一下子晕起来了. Why can it just be "yunle" ? Q4. How do you indicate " if or if not " in chinese? " Q5. Does 上不了 mean "can not" ? How do i use this in a setence? thank you.