become用法为什么become true 解释为系表,变为现实.而不能用become truth?

become用法为什么become true 解释为系表,变为现实.而不能用become truth? 下面补充例句中的“become”,为什么不能用“became”呢? has become 是什么 用法. become的用法 become friendly become friends ______many years later_______the whole truth become known. 为什么become前加have?（Cycling has become my favourite.）这是什么用法? become 和been的用法 you have turn twenty already,为什么填turn而不填become passed 或者grow become the become addicted become过去式