On going into the kitchen,I turned on the light because it was dark.In winding itself round the wires,the snake had send sparks to the ground and this caused the fire.这两句话逗号前是状语从句吗，在现在分词前为什么要加一个介词，可以去掉吗?
...aims about the physical world were often accepted as true if they were reasonable; experimental verification, if thought necessary at all, was perfunctory 请问老师，if什么时候表示即使的含义，有什么规律吗？ 3.CONJ-SUBORD 连词(表示与句子主要部分的陈...
...释义分别为：electric: connected with electricity; using, produced by or producing electricity. electrical:connected with electricity; using or producing electricity。释义非常接近，而电系统，我理解为：connected with electricity.
1）My car is bigger than yours.2) A chimp has as much I.Q. as a child of five or six does.第1）句中，yours后面没有is，只有my car和yours对称。那么2）句中的does是否可以省略呢？将chimp和a child of five or six对称。
Our Great Larry Kudlow, who has been working so hard on trade and the economy, has just suffered a heart attack. He is now in Walter Reed Medical Center.这是特朗普最新的推特，译文是：我们伟大的拉里·库德洛，一直在贸易和经济方面工作努力工作，他刚刚...
...In the early 1980s, the
computer giant, IBM produced the world's first Personal Computer. This ran on
an 'operating system' called DOS, produced by a then small company named
Microsoft. The IBM Personal Computer was widely copied. From those humble
beginnings, we have seen the development of the use...
The CDs are _______! Buy one and you get one completely free. A. on sale B. for sale C. in sale D. with sale 选项 C 和D 比较好排除，但分不清是 on sale 还是 for sale，求讲解！谢谢！
Whether children should be taught to complete or to cooperate 为什么有两个to?如题，名词性从句whether的用法好像常见的是 whether to do A or B但是在雅思作文中看到这个用法，为什么有两个to呢？第一次发问如有不妥老师们见谅
...ed rather than have breathed a syllable of my view.2）I would rather have gone to the theater than stayed home last night. （该句来自 http://ask.yygrammar.com/q-39997.html ）对比上述2个句子，很明显，1）句than后是完成时，2)句than后是过去时请教老师：a) 是would ra...
填空题：
On the one hand, I always get up too late and have too little time to have breakfast. On the other hand, I hate going to work ________ an empty stomach.
所给答案是on，但是可以填with吗？