1. can't 根據(jù)其基本用法可譯為: (1) 不會。例如: I can't speak English. 我不會說英語。 (2) 不能。例如: We can't do it now because it's too dark.天太黑了,我們現(xiàn)在干不了。 (3) 否定句中表示推測,意為“不可能”。例如: The man can't be our teacher because he is much younger than our teacher. 那個人不可能是咱們老師,他年輕得多。 2. mustn't 意為“禁止、不許”, 用來表達命令,表示強烈的語氣。 例如: You mustn't play football in the street. It's too dangerous.你不可以在街上踢足球,太危險了。