一些：similar function with 一点儿( 一点儿mainly used in North China, while 一些more often appears in South China)
1. 有(一)些means: have a little bit... which is a verb. Can be followed by adj. adv. noun.
Eg: 我有一些冷。（I feel little bit cold. Followed by adj.)
这车有一些慢。（This car is little bit slow. Followed by adv.)
那家店有一些存货，你要吗？( That shop has some left over goods, do you want them? Followed by noun.)
2. (一)些 means: a little.
which is 1. adj. to modify noun. 2. adv. follow adj.or adv. means comparative.
Eg: 1. 我们还剩一些时间.( We still have some time left. Followed by noun.)
你再盛一些汤.( Please get some more soup. Followed by noun.)
2.你有小一些的鞋吗? ( Do you have smaller shoes? Follow SMALL and change it to SMALLER)
我今天好一些. ( I feel better today. Follow GOOD and change it to BETTER)
差：this character has 3 pronunciations: chà ; chā ; chāi
chà: 1. not good. E.g: 这个质量很差。( The quality of this one is not good.)
2. almost, nearly. In 查不多or 差点儿phrase. E.g: 我差不多到了。( I’m
almost there.) 我差点就做完了。( I almost finished.)
3. shortage, less,shot E.g: 差五分三点.(I’t 5 to 3 o’clock）(short 5 mins to 3)
我钱不够，差10块。(I don’t have enough money, short 10 yuan.)
chā : the difference. E.g: 五和三的差是二(The difference between 5 and 3 is 2）
这两个没有差别（Thereis no difference between these two.）
chāi : to go on business trip. In 出差phrase. 我明天出差。( I’m going on
business trip tomorrow.)