Recently I sent a postcard to my sister who was living in another town.My sister did not receive it and I was wondering why.Then one morning the postman brought a letter for me.,想问一下，为什么postman前用the不用a，前文他没出来啊。谢谢帮忙！
...failed up reaching Mars, one ______ (burn) up in the planet’s atmosphere and the other ______ (disappear) after a software failure. 这个句子，我设想了几个答案，请问老师们哪些是正确的，哪些是错的。第一空：burning; having burned; burned; having been burned第...
...y climatic changes in seasonally frozen areas are as namely, freeze–thaw and wet–dry cycles, have been recognized as a major factor in the poor engineering performance of such soils.请问这句话中are as namely 是做什么成分？怎么后面直接加have been了，也没见连接词啊
BBVA（Banco Bilbao Vizcaya）from Argentina says soybeans and iron ore just right here which is used for steel account for 40 to 50 percent of all Brazil’s export to China.just right here怎么理解？都有哪些用法？
He looked at the children playing under the tree and felt pleased. 想问下老师,这个句子里面playing under the tree 对 children来说,是定语还是宾补?而后半句 felt pleased 可以理解为修饰children的吗?
They had been invited to a Hindu wedding and were not sure what happened on such occasions. 请问老师（1）what引导的是什么从句？（2）on such occasions是时间状语还是地点状语，另外具体是哪种状语是靠语义区分的吗？
...dial action of adjusting washing time, washing temperature, cylinder speed and making different sets of paper pattern match with different batches fabric shrinkage, still have given rise to loss.had just been，have given句中这两个时态我不是很确定，不知道用现在完成时，还是...
Finally Richards got up and strode aimlessly about the room, ploughing his hands through his hair, much as a somnambulist might do who was having a bad dream.1. ploughing his hands through - 词典上没找到这样类似的用法。2. 上面much as是否省略了一个as？应该是as much as, ...
...ergarten children who could play in a natural environment had less illness and greater physical ability than children used only to a normal playground.
请问老师这里的used only to语法上应该怎么理解呢？"习惯"的表达不是"be used to sth"吗，这个表达法可以做后置...
The United States Geological Survey (USGS) said
Sunday the island had experienced more than 500 earthquakes—13 with a magnitude greater than 4.0—in the 24 hours following the 6.9-magnitude quake.The concern for residents continues to be the lava and
gas emitted from vents, though.官方译文：...
These younger volunteers would be familiar with and competent using
technologies such as activity trackers.问：我觉的这个句子是不是错的？be familiar with和 be competent to 是并列的两个短语而此处competent后没有介词 to，有be competent at
doing sth: 在某事/方面有...
Most importantly,
your time and effort at senior high school will open the door to your
potential.这是高中英语新教材译林版必修1第1单元的句子(p2)。请问这里为什么是用 most
importantly，我在另一本工具书上看到的是 most important：Most important,
she’s got a...