作业帮a month ago/a month before那个可以用在过去完成时?
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a month ago/a month before那个可以用在过去完成时?
a month ago/a month before那个可以用在过去完成时?
a month ago/a month before那个可以用在过去完成时?
应该是before 和 ago 吧?
记得一点 前者可以是时间点 后者必须是时间段
ago和before的区别
ago和before这两个词都可以作“以前”解.ago是副词,因此表示时间段的词语常常放在它前面,含义是从现在算起的若干时间以前,谓语动词一般使用过去时.例如：He
can ride a bike now but he couldn't a few weeks
ago．他现在会骑自行车了,可是他几个星期以前不会.before可以用作介词,后接某个时间点.例如：
Please come to my office before nine o'clock. 请在九点以前到我办公室.
before.也可以用作副词,通常表示从过去某一时刻算起的若干时间以前,谓语动词常用过去完成时.例如：He said that he had seen the
film a month before. 他说他在一个月以前就看过这部电影了.
before可以用在现在完成时、一般过去时的句子里,不伴有具体的时间而单独使用,表示笼统、不明确的“以前”.例如：
I've read this book before．我以前看过这本书.before还可以用作连词.例如：
Where did your sister study before she joined the army? 你妹妹在参军以前,在哪学习?
所以应该用
a month before
a month ago
He has been away _____.[ ] A.since a month B.for a month C.for a month ago D.in a month
He has been away _____.[ ] A.since a month B.for a month C.for a month ago D.in a month个个选项都要解释
a month ago/a month before那个可以用在过去完成时?
He left this city last month.(用since a month ago 改写）
Our school sports meeting______(举行)a month ago.
he_________(come) back a month ago.(要原因）
After a month.A month later区别
He left this city last month= He____ ____ ____from this city since a month ago用since a month ago改写
翻译:Twice a month
More than a month
a month older than
a month?long or
twice a month
a month 什么意思
A crazy month
Tom said that he had begun the work______.A.for a month B.a month ago C.a month beforD.a month later为什么选D项?D项和C项有什么区别呢?
The thief broke into the house _____ the windowsA by B across C through D thoughThey will come here____？A a month ago B a month before C in a month D a month 说原因
He has been away ____A.How long B.How often C.How soonD.How far说明理由A.since a month B.for a month C.for a month ago D.in a month打错了，sorry