一般現(xiàn)在時L'm a student. l'm not a student Are you a student?
一般將來時l'll be a student. l won't do it. Will you go with me?
一般過去時l was a student. l was not a student.Were you at home two hours ago?
現(xiàn)在進行時 l'm typing. l'm not typing.Are you typing?
現(xiàn)在完成時l've done it.l've not done it.Have you done it?
過去進行時l was sleeping while he telephoned me.l was not sleeping while he telephoned me.Were you sleeping while he telephoned you.必須是一個時間點
過去完成時l had done it before he called me.l had not done it before he called me.Had you done it before he called me?