举几个例子: already——I have alraeady drunk coffee 我已经喝过咖啡了 yet————1. 用于否定句中,意思是“还、尚、迄今、到那时”。例如: He has not yet here. 他还未到。 2. 用于疑问句中,意思是“已经”。例如: Has he drunk coffee yet ? 他已经喝过咖啡了吗? 但yet还有其他用法。(但你现在应该还用不到) just————I have just drunk a cup of coffee 我刚刚喝了一杯咖啡
already可中可末表已经 如No, thanks. I have already had my breakfast. No, thanks. I have had my breakfast already. just只能在中间表刚刚 如No, thanks. I have just had my breakfast. yet只能在末表否定 如Thanks. I haven't had my breakfast yet.