问题 from...to...是介词吗（可以用作宾语吗）

European sailing ships had from two to six masts.老师，这里的from...to..是介词，have是动词，请问如何理解？

问题 Adj+to的结构

Doris walked in the forest causiouly, afraid of being attacked by giant snakes.I tiptoed into my father's room, careful to step over the creaky floor.这两句话我都能看懂，但是无法理解 afraid of 和 careful to的表达和做的成分

问题 introduce sb to sth与introduce

下面的用法与搭配是否正确？introduce sb to sth 把某人介绍给某物introduce sth to sb 把某物介绍给某人谢谢！

问题 everything to none 的意思

Good families are much to all their members, but ________ to none.A．somethingB．anythingC．everythingD．nothing这是2014年高考英语江苏卷的一道选择题。我想知道这句话到底是什么意思呢？

问题 be to do sth与be doing sth

The best way to learn new words is reading  English magazines. My dream is to be a teacher. 为什么一个是 to do，一个是doing？有什么具体用法吗？

问题 retire to their yachts or country estates的划分

most of his peers were retiring to their yachts or country estates这里应该是将retire to作为及物动词来看，还是将to之后的成分看作地点状语

问题 bring...to和grow into play如何理解

In order to get the sunshine and bring its will to grow into play, no matter how heavy the rocks are and how narrow the space between the rocks...请问老师这个句子中，bring...to和grow into play如何理解？

问题 too...to和so...that...

The shoes are too small to wear.The shoes are so small that I can't wear them.为什么too...to中wear后面不需要再加宾语了呢

问题 help sb do sth的被动语态必须加to吗

主动语态的 help sb (to) do sth 的 to 是可有可无的。而 help sb do sth 的被动语态是不是必须要加上 to 呢？（省略就算错吗）

问题 seem to ..that.. 这样的句式还是表语从句吗

（1）It seems to me that she complains of a headache. （2）It seems to be true that we are the same age.  感觉它和it seems that不一样，有了to后主句挺完整了，此时that从句是否可以看作是主语从句了？

话题 this was going to be a big day Vs there was going to be a big day

问题 without exception to my knowledge是什么意思

And as discussion of language acquisition becomes more substantive, it moves to assumptions about the language organ that are more rich and domain specific, without exception to my knowledge.请问：without exception to my knowledge是什么意思？

问题 sure of doing../ sure to do...成分问题

请问老师，以下搭配中of doing sth 和 to do sth分别做什么成分？： be sure of dong sthbe sure to do sthmake sure of dong sthmake sure to do sth      

问题 to have done和having done的区别

Whether there is something very special about the Earth to have fostered the variety of life forms.这里的to have fostered是something 的定语吗？如果用having fostered 和用to have fostered的区别在哪？不定式比现在分词突出是一次性/具体事件？

问题 yield to的意思与用法

Even the recalcitrant car-crash simulations, he thinks, will yield to the new approach soon.他认为，即便是顽固的汽车碰撞模拟问题不久也会出现新的解决方法。我认为这个 yield to 是屈服于的意思，对么？