1. already的用法: (1)译作“已经”,通常用于完成时的肯定句中。如 I have already read the book. / Some visitors have come already. 位置:通常放在助动词后,过去分词前或句尾。 (2)有时already也可用于疑问句中,表示惊讶或明知故问等感情色彩。如 Has the little boy has already got home alone? (惊讶) / Has he forgotten everything already? (明知故问) (3)在陈述客观事实的情况下,already也可用于一般现在时或一般过去时。如 He is/was already a middle school student.
2. yet的用法: (1)译作“已经”,通常用于完成时疑问句中。如 Have you cleaned the room yet? 位置:句尾。 (2)译作“还”,通常用于完成时否定句中。如 I haven’t brushed my teeth yet. 位置:句尾。 (3)还可用作conj.,译作“然而”。如 Though she was very tired, yet she didn’t want to give up. 位置:并列句的后一个分句的句首。