如何辨别situation,condition,case,state这几个词的用法?

situation
n.情形, 境遇, (建筑物等的)位置
condition
n.条件, 情形, 环境, 社会地位
vt.以...为条件, 使达到要求的情况
case
n.事, 病例, 案例, 情形, 场合, 讼案, 容器, (语法)格
Case n. 〈计〉计算机辅助软件工程
CASE =Centre for Advanced Studies in Environment 环境高级研究中心([英]建筑协会)
state
n.情形, 状态, 国家, *, 州
adj.国家的, 国有的, 国营的, 州的, 正式的, 典礼用的
vt.声明, 陈述, 规定

I am trying to give you some help by using these words in real sentences.\x14
By the question you asked,I can tell what STATE you are in English study.\x14
Your question brings a CASE about how to learn English well.
In your SITUATION,I would say that "reading a lot" is one of the best ways to learn a foreign language under the CONDITION that you are not living in a English speaking country.