1. 用作連系動詞，其後可接名詞、形容詞、過去分詞等作表語：
The weather became warmer. 天氣變得暖和起來。
Soon the roombecame crowded. 不壹會兒房裏就擠滿了人。
He became a teacher at (the age of) 17. 他17歲就當了老師。
註意：其後接過去分詞時，可表示被動或結果;但表示被動時，其後壹般不接 by短語。比如不說：
Soon the room became crowded bystudents.
2. become 是終止性動詞，因此要表示?成為?有多長時間?，英語不能將become與表示壹段時間的詞或短語連用：
他成為老師有十年了。
正：He has been a teacher for ten years.
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 之後壹般不接不定式表示?逐漸? (此時可用 come / begin+不定式)：
正：He became ill yesterday. 他昨天病了。
誤：He became to be ill yesterday.
正：He began [came] to like English. 他開始喜歡英語起來。
誤：He became to like English.
4. 用於習語 become of, 表示?發生?、?遭遇?等 (常與 what連用)：
What has become of the girl? 這個女孩後來怎樣了?
I don?t know what will become of me if I fail this time. 要是我這次不成功，我不知我會怎麽樣。