【正文】
到上周末,史密斯夫婦已經(jīng)在中國旅游了 60天了。 你學(xué)習(xí)三個小時了,該休息了。 (2). 他來的時候我已經(jīng)等了近半個小時了。如 : My brother has joined the army since 4 years ago. My brother has been in the army since for years ago. √ My brother joined the army 4 years ago. √ Ⅷ . 過去完成時 : had+動詞的過去分詞 2. 過去完成時的使用: 表示過去某一時刻之前或過去某一動作之前已經(jīng)完成的動作。 (2). 到現(xiàn)在為止她共獲過 五次獎。 常與 already, yet(用于疑問句或否定句 ), up to now= so far= by now= till now, just, ever, never, recently, in the last/ past few years, in recent years, since two years ago, for a few days 等連用。 昨天一上午他們都在開會。 (1). Mike is writing a letter of thanks. (2). China is making great advances in medicine. (3). They are ing by plane tomorrow. Ⅵ . 過去進(jìn)行時 : was / were +動詞的現(xiàn)在分詞 : 表示過去某一時刻或某一段時間內(nèi)正在進(jìn)行的動作句中往往有過去的時間狀語。 (2). 中國在醫(yī)學(xué)上正迅速發(fā)展。主要用于 e, go, leave, arrive, start 等動詞。 (2). 表