(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 ...”。

e.g.:

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. 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.