有的动词既可当实义动词又可当系动词 这种情况下如何判断句子结构

这类动词的用法类似be (is,am,are,was,were),但意思更具体明确,大部分同感官有关.试比较:
1a.Your idea is great.你的主意不错.
1b.Your idea SOUNDS great!你的主意听起来不错呵!(系动词)
1c.P in psychology is not sounded.P在心理学一词中不发音.(实义动词)
2a.The house is new.房子新.
2b.The house LOOKS new.房子看起来新.(系动词)
2c.He is looking at the new house.他正看着那栋新房.(实义动词)
3a.The soups is delicious.汤鲜美.
3b.The soups TASTES delicious.汤尝起来味道鲜美.(系动词)
3c.The chef is tasting the soup.大橱在品尝汤味.(实义动词)
4a.The guest room is fresh.客房(空气)清爽.
4b.The guest room SMELLS fresh.客房闻起来(空气)清爽.(系动词)
4c.We smell with our noses.我们用鼻嗅东西.(实义动词)
5a.The table cloth is soft.桌布柔软.
5b.The table cloth FEELS soft.桌布摸起来柔软.(系动词)
5c.The doctor is feeling his patient's pulse.大夫在号病人的脉.(实义动词)
6a.The monument is tall.纪念碑很高.
6b.The monument STANDS tall.纪念碑高高耸立.(系动词)
6c.They are standing by the monument.他们站在纪念碑旁.
(实义动词)
以上,a句用的是普通系动词,b句用的是既可做实义动词,又可做系动词的特殊系动词.

这里有详细介绍
http://www.***.com/en/z/grammar/0501.htm