“get adj.”变得怎样怎样可以改成“become adj.”吗?为什么?

“get+形容词”多用在口语中.get能替代become,但become较为正式.get与become前面的主语既可以是人也可以是物.
e.g.He became/got angry with his son.
get经常与形容词的比较级连用.
e.g.The days are getting longer and longer after the winter solstice.
冬至过后,天变得越来越长.
系动词become一般不可用来表示“将来变得……”的意思.