在句子开头的连词或副词
(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，apparently，fortunately，clearly，unfortunately，incredibly，luckily， without doubt， 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.
And, but, or, for, so, yet等并列连词开头
现今，除了非常正式严肃的写作，以连词开头的句子现在已被接受
将这类连词以连接副词或者短语代替（例如，以in addition 代and, however 代but, alternatively 代 or, consequently 代so )