unless 除非,如果不 (= if…not) 例如 I shall go tomorrow unless it rains. 如果不下雨,我明天会去.------Shall Tom go and play football? ------Not unless he has finished his homework. 汤姆要去踢足球...
All his teachers did their best to improve his study try one's best to do sth= do one's best to do sth you can't speak English well if you don't practice it every day unless除非 = if .not 如果.不
