“才”和“就” Comparison of "才" and "就"

“就+动词”表示承接上文，得出结论。
The structure "就+verb" indicates a conclusion or a resolution made on the basis of what's been mentioned previously.

“一……就……”结构可表示两件事情紧接着发生。两件事情的主语可以相同，也可不同。例如：
The structure "一……就……" (...as soon as…) can indicate two events happening one immediately after the other. The two events may or may not share the same subject. For example:

• 100年前，塑料一出现就受到人们的普遍欢迎。
• 等女儿一回来我就告诉她这个好消息。

“一……就……”结构表示“要是……就……”的意思，“一”后面表示条件，“就”后面表示在前一个条件下产生的情况。两种成分的主语可以相同，也可不同。例如：
"一……就……" can also mean "If..., then...", in which "一" is followed by a situation that indicates a condition, and "就" is followed by a situation that would occur under the condition. The two situations may or may not share the same subject. For example:

• 儿子小时候一说话就脸红，回答老师问题的时候声音也很小，我当时很为他担心。

• 父母必须让孩子从小就知道，不是所有的东西一哭就能得到。

• 妈妈一进房间，他就把手机装了起来。