很多学生在托福学习中遇到了这样的问题“一个句子很长，里面还出现好多陌生词汇，句子重点想表达的内容找不到，不知道句子主干在哪里”。解决这个问题的关键是学好谓语动词和非谓语动词。

　　在了解完谓语动词和非谓语动词是什么之后(详见“托福语法——非谓语动词)，我们要明确这样两个数字，“32”，“10”。

　　32指谓语动词的32种形式，其中包括：语态2种：主动和被动，时态16种。

　　10指非谓语动词的10种形式。

　　长难句练习

　　找出谓语动词和非谓语动词

　　1.Moreover, recent research on obsidian tools found at Olmec sites has shown that some

　　of the obsidian obtained by the Olmecs originated near Teotihuacán.

　　谓语动词：has shown，originated

　　非谓语动词：found，obtained

　　2.Although initially appealing, the hypothesis of a simple climatic change related to sea

　　levels is insufficient to explain all the data.

　　谓语动词： is

　　非谓语动词：appealing，related，to explain

　　3.In the seventeenth century, the trading activities of the Dutch East India Company

　　resulted in vast quantities of decorated Chinese porcelain being brought to Europe.

　　谓语动词：resulted

　　非谓语动词：being brought

　　4. A worsening of the plight of deer was to be expected as settlers encroached on the land, logging, burning, and clearing, eventually replacing a wilderness landscape with roads, cities, towns, and factories.

　　谓语动词：was，encroached

　　非谓语动词：logging, burning, clearing, replacing

　　5.The culture of that time, based on archaeology and linguistic reconstruction, is assumed to have had a broad inventory of cultivated plants including taro, yarns, banana, sugarcane, breadfruit, coconut, sago, and rice.

　　谓语动词：is assumed

　　非谓语动词：based, to have

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