1 用副詞開頭，常見的情形有：
(1)副詞修飾全句
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.
修飾全句常用的副詞有：
obviously undoubtedly
apparetly fortunately
clearly unfortunately
incredibly luckily
unluckily surprisingly
frighteningly
這些副詞大多數表示說話人對全句的看法，在意思上相等與“It is ... 形容詞 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) 強調副詞
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) 副詞表示某一地域或某一領域
Geographically, Canada is the biggest country in the world.
Financially, she is independent, but emotionally she is dependent.
2. 托福中用插入語開頭，表示說話人的態度，或使句子的意思更加準確：
Strangely enough, Jennifer does not enjoy sunshine and beach.
Generally speaking, winter in Vancouver is gloomy.
類似的插入語有：
no wonder no doubt
in other words in my opinion
in conclusion in fact
as a matter of fact
3. 用形容詞、并列形容詞或形容詞短語開頭，修飾句子的主語，表示主語的特征或狀態：
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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