注意中国学生容易搞错的问题：
There isn't enough furniture in the room.(房间里家具不够)
错：There hasn't enough furniture in the room.
There is no doubt that smallpox has been wiped out in China.(毫无疑问，中国已消灭天花。)
错：It is no doubt that smallpox has been wiped out in China.
There is ample evidence that AIDS is spreading quickly in Asia. (充分医学全.在线www.med126.com证据表明，爱滋病正在亚洲迅速蔓延。—— 同位语从句)
错：It is evidence that AIDS is spreading quickly in Asia. (可以： It is evident that AIDS is spreading quickly in Asia. - 主语从句)
(二)第二句型：主语 + 不及物动词 (+ 其他成分)
在这个句型中主要注意及物动词与不及物动词的区分：不及物动词 及物动词
rise /rose / risen(升起) raise /raised / raised (提高)
arise / arose / arisen (from)(产生) arouse / aroused / aroused(唤起)
lie / lay / lain(躺下) lay / laid / laid(放下) arrive at(到达) reach(到达)
wait for(等待) await(等待) remain(仍旧) maintain(保持，维修)
*上面所注仅为典型词义，要根据句子判别医学 全在.线提供www.med126.com其他意思。
此外，该句型常采用倒装形式，注意辨别，主要是以下两种情况：
1) 用here 或 there引导：Here comes the bus. (汽车来了。) / There rings the bell. (铃响了。)
2) 在动词 + 介词短语的结构中，往往将介词短语提前：On the top of the hill stands a pretty little house.(山顶上有一座漂亮的小房子。)
(三)第三句型：主语 + 及物动词 + 宾语
我们知道，名词可以做主语和宾语，非谓语动词 -ing和 to do也可以做主语和宾语，
作主语： Learning a foreign language is not easy.(学门外语并不容易。) To learn a foreign language is not easy. (= It is not easy to learn a foreign language.)
从语法角度讲，上述两个表达方式都可以。
但是，当动词处于宾语位置时，就不能这样"随心所欲"了，因为英语语法有以下几个规定： 1)acknowledge / admit / appreciate / avoid / consider / contemplate / defer / deny / dislike / enjoy / escape / evade / excuse / facilitate / fancy / favor / feel like / finish / give up / cannot help / cannot stand / imagine / include / keep (on) / do not mind / miss / permit / practice / regret / resent / risk / suggest 等词后面的动词宾语必须用-ing 形式，重点和首先要掌握黑体字部分。由于这些次的词义与解题关系不大，没有给出具体词义解释。若需要，请学生自己查字典解决。
这是语法考试的一个重点，要对以上词特别敏感，例如：
It is impossible to avoid ______ by the stormy weather.
A. being much affected
B. having much affected
C. to be much affected
D. to have been much affected
