prove这个词是一个难点

prove是终止系动词

表示主语已终止动作， 表达"证实"，"变成"之意，例如：

The rumor proved false. 这谣言证实有假。

The search proved difficult. 搜查证实很难。

系动词无被动语态：

如：prove appear, be become, fall, feel, get, grow, keep, look, remain, seem, smell, sound, stay, taste, turn

这里是进行时 prove作系动词时没有被动语态

需要更详细的解释和列句 请查阅字典 比如 牛津高阶

下面是从牛津的网站上找到的

请看BE释义中的 [v-adj]的第二个例句

prove(WORD FAMILY: prove verb disprove | proof noun | proven adj. unproven) /pruv/ verb (proved, proved) or (proved, proven /pruvn/ especially in NAmE) In BrE proved is the more common form. Look also at proven.

SHOW STH IS TRUE

1 ~ sth (to sb) to use facts, evidence, etc. to show that sth is true: [vn] They hope this new evidence will prove her innocence. ‘I know you’re lying.’ ‘Prove it!’ Just give me a chance and I’ll prove it to you. He felt he needed to prove his point (= show other people that he was right). Are you just doing this to prove a point? What are you trying to prove? I certainly don’t have anything to prove—my record speaks for itself. [v (that)] This proves (that) I was right. [vn-adj] She was determined to prove everyone wrong. In this country, you are innocent until proved guilty. [v wh-] This just proves what I have been saying for some time. [vn that] Can it be proved that he did commit these offences? [also vn-n, vn to inf] disprove—see also proof

BE

2 linking verb if sth proves dangerous, expensive, etc. or if it proves to be dangerous, etc., you discover that it is dangerous, etc. over a period of time turn out: [v-adj] The opposition proved too strong for him. It was proving extremely difficult to establish the truth. [v-n] Shares in the industry proved a poor investment. His lack of experience may prove a problem in a crisis. [v to inf] The promotion proved to be a turning point in his career. Their fears proved to be groundless.

YOURSELF

3 [vn] ~ yourself (to sb) to show other people how good you are at doing sth or that you are capable of doing sth: He constantly feels he has to prove himself to others.

4 ~ yourself sth / to be sth to show other people that you are a particular type of person or that you have a particular quality: [vn-adj] He proved himself determined to succeed. [also vn-n, vn to inf]

OF BREAD

5 [v] to swell before being baked because of the action of yeast rise

see exception