be,become,get和turn的用法区别

*be表示“成为”时,多用于将来时、祈使句或不定式。如:
I would like to be a bus-driver.
My younger sister wants to be a movie star.
*become多指身份、职位等的变化,强调变化的过程已经完成,后面可接名词或形容词。如:
Later the boy became an artist.
Her mother became angry when she heard the news.
*get多用于口语,表示一种变化过程,强调的是“渐渐变得”,后常接形容词的比较级。如:
It’s getting darker and darker outside.
In winter the days get shorter.
*turn指在颜色和性质等方面与以前的完全不同,强调变化的结果。如:
Leaves turned brown in the mountains.

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