become的过去分词写法不变，仍然是become，除此之外，become的过去式是became，现在分词是becomeing。
1.用作连系动词，其后可接名词、形容词、过去分词等作表语：
He became a teacher at (the age of) 17.他17岁就当了老师。
The weather became warmer.天气变得暖和起来。
Soon the roombecame crowded.不一会儿房里就挤满了人。
注意：其后接过去分词时，可表示被动或结果；但表示被动时，其后一般不接by短语。比如不说：Soon the room became crowded bystudents.
2.become是终止性动词，因此要表示“成为…有多长时间”，英语不能将become与表示一段时间的词或短语连用：
他成为老师有十年了。
He became a teacher ten years ago.
It’s ten years since he became a teacher.
He has been a teacher for ten years.
3.become之后一般不接不定式表示“逐渐…” (此时可用come/begin＋不定式)：
正：He began [came] to like English.他开始喜欢英语起来。
正：He became ill yesterday.他昨天病了。
4. 用于习语become of,表示“发生”、“遭遇”等 (常与what连用)：
What has become of the girl?这个女孩后来怎样了?
I don’t know what will become of me if I fail this time.要是我这次不成功，我不知我会怎么样。
become的短语Be becoming
相称百;适宜;合适
Become accustomed to; become used to
对度..习以为常知
Cause .. to become; make .. become
使..变成道..
To become a scapegoat
背黑锅内
To become untied.
被解开(或解容下)
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