用法：

　　1.用作連系動(dòng)詞，其后可接名詞、形容詞、過(guò)去分詞等作表語(yǔ)：

　　He became a teacher at (the age of)17.他17歲就當了老師。

　　The weather became warmer.天氣變得暖和起來(lái)。

　　注意：其后接過(guò)去分詞時(shí)，可表示被動(dòng)或結果；但表示被動(dòng)時(shí)，其后一般不接by短語(yǔ)。比如不說(shuō)：

　　Soon the room became crowded bystudents.

　　2.become是終止性動(dòng)詞，因此要表示“成為…有多長(cháng)時(shí)間”，英語(yǔ)不能將become與表示一段時(shí)間的詞或短語(yǔ)連用：

　　他成為老師有十年了。

　　正：He became a teacher ten years ago.

　　正：It’s ten years since he became a teacher.

　　誤：He has become a teacher for ten years.

　　3.become之后一般不接不定式表示“逐漸…”(此時(shí)可用come/begin＋不定式)：

　　正：He began [came] to like English.他開(kāi)始喜歡英語(yǔ)起來(lái)。

　　誤：He became to like English.

　　正：He became ill yesterday.他昨天病了。

　　誤：He became to be ill yesterday.

　　4.用于習語(yǔ)becomeof,表示“發(fā)生”、“遭遇”等(常與what連用)：

　　What has become of the girl?這個(gè)女孩后來(lái)怎樣了?

　　I don’t know what will become of me if I fail this time.要是我這次不成功，我不知我會(huì )怎么樣。