根据动词的特性，构成英语中五个基本句型：
1) 主语 + 系动词 + 表语
2) 主语 + 不及物动词
3) 主语 + 及物动词 + 宾语
4) 主语 + 及物动词 + 双宾语
5) 主语 + 及物动词 + 宾语 + 宾语补足语
我们在学习5个基本句型时，主要关心每个句型中的出题点在哪里。
第一句型：主语 + 系动词 + 表语
1) 系动词一般为be 动词。
注意：look, feel, sound, smell, taste, get, become, come, go, turn, grow, keep, seem, stand等词可以作半系动词用，按行为动词方式变化，起系动词的作用。
试验比较：
He felt the pockets thoroughly but did not find a single penny.
You look pale. Do you feel unwell?
一般来说，动词后面跟的是个形容词或名词，该动词为系动词， 如：The plan sounds perfect. / The flower smells nice. / The dish tastes delicious. / It is getting dark.
实例：
Dont worry. Let me take your pulse first. Oh, it ______ normal.
A. is felt
B. is feeling
C. feels
D. felt
解题思路：normal为形容词，前面应为系动词;系动词没有被动语态，故A不对; look, feel, sound, taste, smell, seem等半系动词一般不用进行时，B也不对;D时态错了，故正确答案为C.
2)there be是英语中非常重要的一个句型： there是引导词，不解释 那里 这是个倒装句, 主语在be动词的后面, be动词的单复数由后面的主语决定。
注意中国学生容易搞错的问题：
There isnt enough furniture in the room.
错：There hasnt enough furniture in the room.
There is no doubt that smallpox has been wiped out in China.
错：It is no doubt that smallpox has been wiped out in China.
There is ample evidence that AIDS is spreading quickly in Asia.
错：It is evidence that AIDS is spreading quickly in Asia.
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