原创《同时不同态》：本文关于同态论文范文,可以做为相关论文参考文献,与写作提纲思路参考。
不少同学在做语法题时,一看到某个时间词或时间短语,就会习惯性地选用某种动词时态.如有的同学一看到“for+一段时间”,就会用完成时.殊不知,这个短语在不同语境中应该使用不同时态.
例1 Mr. Li has left and ____ for you for 20 minutes.
A. has waited B. had waited
C. waited D. has been waiting
解析：虽然题干中出现了for 20 minutes,但是,前句说“Mr. Li has left”,说明“wait”与现在无关,只是过去的行为且不是发生在过去某时之前,所以只能用一般过去时.答案选C.
例2 Please tell me your next plan for I ____ there for a few days.
A. has stayed B. will stay
C. stayed D. has been staying
解析：这里出现了for a few days表示一段时间.但前面说“请把你的下一个计划告诉我”,说明stay是将来的动作,所以要用一般将来时,故选B.
例3 There ____ great changes for the last two years.
A. he been B. will be
C. has been D. were
解析：句子中有for the last two years,last表达的是“刚刚过去的”且与现在有关.所以,这里用现在完成时.句子的主语是changes,为复数,所以选A.
归纳：这里所说的“同时不同态”,是指同一个时间短语,并不能绝对地确定一个动作发生的具体时间,须根据语境来定.只有找到了具体语境中的时间才能正确判断它的时态,这是我们正确选用动词时态的关键所在.类似的情况很多,下面再以then这个时间状语为例,请大家仔细体会.
练一练：
1. — What were you doing at ten last night?
— I ____ some students with English then.
A. helped B. would help
C. is helping D. was helping
2. Life ____ harder then because neither of us had a job.
A. was B. would be C. had been D. will be
3. I’ve been invited to the meeting too, so I ____ you then.
A. would see B. will see
C. saw D. was seeing
4. Don’t come to see Mr. White at five tomorrow. He ____ an important meeting then.
A. had B. will he seen
C. will be hing D. will he
5. Call again next week. They ____ a decision by then.
A. are reaching B. will reach
C. he reached D. will he reached
答案及解析
1.选D.then是指问句中的at ten last night,指过去某个时间点正在发生的事,用过去进行时.
2.选A.根据后句的had可知then指过去的时间,且这里指过去某时的状态,所以用一般过去时.
3.选B.根据前句语境可知then是指将来的时间,所以用一般将来时.
4.选C.then是指at five tomorrow,是将来某个时间点正在发生的事,用将来进行时.
5.选D.then是指next week.by then为“到那时”.到将来的某个时间点为止做了某事,用将来完成时.（责任编校 周丹）
同态论文参考资料：
结论：同时不同态为大学硕士与本科同态毕业论文开题报告范文和相关优秀学术职称论文参考文献资料下载，关于免费教你怎么写同态方面论文范文。
