谢谢！

Dose the "symbols" you refered mean taht some a Chinese chracter that can change the meaning of one sentence? or something? It is not very clear about your question, however the example below might be the answer you are looking for: “了” "已经"“过”t these three words usually added into one sentence after the verb express past time, meaning the things you have done or the action you did.: 我吃过饭了/我吃了饭了/我已经吃了饭了 "现在" means now, and it can be added in front of the verb to state that you are going to do , (present time) 我现在去吃饭 I am going to have something/lucnch,,, “被”“由”“为...了” these phrases in Chinese often used to make of negative clause: 牛奶被我喝了， The milk was drunk by me ,, and so on,

sorry, i don't understand...