下面的4道习题要求处理好真实条件句中的动词形式问题：1. If she promised/ has promised (promise) to be here, she will certainly come. 2. If he said (say) that, he must be a fool. 除了横线上的标准答案，...
...过去的虚拟还是对现在的虚拟?He talks as if he had known John since boyhood. 请问老师这句话中，虚拟语态是对过去的事情进行虚拟还是对现在的事情进行虚拟呢？现在有两种说法：对过去的虚拟；对现在hsa know John since boyhood的虚拟。
A robot arm from the Endeavour will grab the telescope and hold it while the astronauts make some necessary repairs. 我的疑问1：while 从句可以用一般将来时吗?可以还是不可以说明原因。我的疑问2：如果主句不用将来时，那么主句和从句的谓语动词都...
（答案上说选A，我感觉有歧义，一道选择题，没上下文）When Alice woke up, she did not know how long she ( ) there.A. had been lyingB. had lain请问老师，为什么选a，选b就一定错误吗？这题严谨吗？我先说一下我的理解：假设：x（过去的过去...
...故事由三部分组成。第三部分关于Dolly的叙事使用了什么时态？起到了何种表达效果？1. Donald
Wryson, in his crusading zeal for upzoning, was out in all kinds of weather,
and let’s say that one night, when he was returning from a referendum in an ice
storm, his car ski...
He is the man visiting us yesterday.He is the man who visited us yesterday.这两句是否都正确呢？我知道现在分词做定语是表示“主动”、“同时”。那这个地方的用法是否有问题呢？Do you know the people coming to the party tomorrow?这个句子我判断应该...
Since her birthday is in late summer, eight months behind mine, I basically became her driver when I
turned 16 in December.请问老师：1 eight months behind mine是名词短语作定语修饰late summer吗？behind mine是介词短语作定语修饰eight months吗？2 behind mine中behind是表...
...都是虚拟语气，所以日常对话中是不是单独出现一句过去时态的句子，就有可能是表示虚拟语气？2. If you flunk out, the university authorities are
obliged to see that you return to your home immediately.夏济安评：“这里you
return的return也是虚拟语气...
在语法书上看到两个句子。第一个是： I didn't know it until you told me .第二个是 : I had heard nothing of what had happened until you told me .为什么第一个主句用的是过去式而第二个句子用的是过去完成时呢？这对我的影响好大。。我觉得第...
(1) Since 1981, only XPS (extruded polystyrene) boards have been used in Finland for the frost insulation of tracks;(2) Since 1981, XPS boards have only been used in Finland for the frost insulation of tracks.我想表达的是自从1981年，只有XPS板用在芬兰的铁路保温，第一句...
prefer后接that从句或接it if...从句，从句谓语动词通常用过去式或should+动词原形，表示现在或将来的情况。如：I'd prefer that
he came next week.I'd prefer that
he (should) come next week.I'd prefer it if he
came next week.I'd prefer it if he
(should) come next week...
M: I agree with your proposal at the meeting this morning. It was a good one.W: You should back me up then, when I needed it.Q: What does the woman mean?A) Her back hurt during the meeting.B) She agreed that it was a good meeting.C) The proposal should be sent back.D) His support would have helped t...