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)。如：He became a teacher at (the age of) 17. 他17歲就當(dāng)了老師。The weather became warmer. 天氣變得暖和起來(lái)。Soon the roombecame crowded. 不一會(huì)兒房里就擠滿了人。注意：其后接過(guò)去分詞時(shí)，可表示被動(dòng)或結(jié)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 by students.
2. become 是終止性動(dòng)詞，因此要表示“成為…有多長(zhǎng)時(shí)間”有多長(zhǎng)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。如：

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. 正：He has been a teacher for ten years. 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)。如：＋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(xí)語(yǔ) become of, 表示“發(fā)生”、“遭遇”等 (常與 what連用)。如：What has become of the girl?　這個(gè)女孩后來(lái)怎樣了?
Idon’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。