【正文】
0。 were At 5:00 last Monday;This time yesterday等現(xiàn)在完成時主語+have +sung過去分詞 has Ever; never;already;Yet; for+一段時間等現(xiàn)在完成進行時主語+have +been singing has Since last year;for ten month;All the time等過去完成時主語+had done 過去分詞過去終止點的時間常用by,before等介詞或一個時間狀語從句;或用as soon as 引導(dǎo)的一個過去時態(tài)的從句。一般將來時主語+shall will am/is/are +going to singTomorrow; the day after tomorrow; in five minutesIn the future等過去將來時主語+should would was/were going to singThe next year 等(往往用語賓語從句中