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2. 托福中用插入语开头，表示说话人的态度，或使句子的意思更加准确：

Strangely enough, Jennifer does not enjoy sunshine and beach.

Generally speaking, winter in Vancouver is gloomy.

类似的插入语有：

no wonder no doubt

in other words in my opinion

in conclusion in fact

as a matter of fact

3. 用形容词、并列形容词或形容词短语开头，修饰句子的主语，表示主语的特征或状态：

Frantic, the young mother rushed out the door with the baby in her arms.

Tasty and crisp, potato chip are a favorite snack for both children and adults.

Happy at his good marks at school, the little boy skipped on his way home.

Desperate and hopeless, the poor man committed suicide.

延伸阅读：

托福写作重点词汇讲解

托福高分语法——插入语

托福写作高分语法——分词结构

更多阅读资料：
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