大家好好 
。
I found in a lot of words, that 子 and 了 comes in the last, but can I know what is it used to
Like,
我很渴 I am thirsty, but if I want to search for thirsty I found 渴了就 so why we use 了
My second question is 子
叉子 is fork but also 叉 without the 子 is still fork
Or 杯子 is a cup but also 杯 is cup
So when do we use both
Another example is 给我一杯水 we didn’t say 杯子
Thanks
勇士好,
There is a nice “Qing Wen” video about your question. As Fiona says it’s like opening pandora’s box don’t mention it on the forum 
Robert
谢谢。。
Thanks for the help
It’s kind of ironic that the hardest word in Chinese is only two simple strokes.
What I understand is some Chinese words are set phrases.
When using 杯 and 叉 in a phrase, it can be 杯子 and 叉子. Also people normally say 一杯水 rather than 一杯子水.
一杯水 means a cup of water. And 一杯子水 is never used in that way as far as I know.
Hi there
Since @Since71 has given you the lesson about “了”. Let me explain the “子” for you. Before I start to explain, you have to know that Chinese prefer “two syllables”; therefore, there are many two-syllable-vocabulary. As for 子, in the case you mentioned, we use 子 as a suffix. Sometimes, it’s used to make a verb or an adjective become a noun; while sometimes it has no meaning. For example:
| suffix（N＋子） | 脑子 [nǎozi ] brain |
|---|---|
| 肚子 [dùzi] stomach | |
| 样子 [yàngzi] appearance | |
| suffix（A＋子） | 胖子 [pàngzi] fat people |
| 瘦子 [shòuzi] skinny people | |
| 疯子 [fēngzi] crazy people | |
| 矮子 [ǎizi] short people | |
| 秃子 [tūzi] bald people | |
| suffix（V＋子） | 骗子 [piànzi] a liar |
| 拍子 [pāizi] tempo | |
| 梳子 [shūzi] comb | |
| 剪子 [jiǎnzi] scissors | |
| 扣子 [kòuzi] button |