before是什么时态的标志答:标志:ago,yesterday,theday before yesterday,last week(year,night,month…),in 1989,just now,at the age of 5,one day,long long ago,once upon a time,etc.结构:①be动词;②行为动词 三、现在进行时:标志:now,at this time,these days,etc.结构:am/is/are+doing 四、过去进行时:...
一般过去时和现在进行时的标志词谢谢~全一些谢谢~答:一般过去时 ago, yesterday, the day before yesterday, last week/year/night/month..., in 1989, just now, at the age of five, one day, ago, long ago, once upon a time, then, on that day.现在完成时 recently, recent years, these days/years, lately, since, for + 时段, ...