1 用副词开头，常见的情形有：
(1)副词修饰全句
Luckily,he didn’t know my phone number;otherwise,he would bother me.
Incredibly,Helena got straight A in her school report this semester.
Interestingly,cats and dogs can hardly get along well in a house.
修饰全句常用的副词有：
obviously undoubtedly
apparetly fortunately
clearly unfortunately
incredibly luckily
unluckily surprisingly
frighteningly
这些副词大多数表示说话人对全句的看法，在意思上相等与“It is ... 形容词 that ...”。
eg:
Obviously,he is nervous about the test.
=It is obvious that he is nervous about the test.
Unfortunately,he tripped over and fell in the mud.
=It is unfortunate that he tripped over and fell in the mud.(2) 强调副词
Hurriedly, the man drew me a scratch map to show me the direction.
Dangerously, the drunkard sped down the street.
Slowly and gently, snowflakes were drifting down from the sky.
(3) 副词表示某一地域或某一领域
Geographically, Canada is the biggest country in the world.
Financially, she is independent, but emotionally she is dependent.
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.
Desperete and hopeless, the poor man committed suicide.
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