副词的构成
从形态上看，大多数副词都是由"形容词+后缀-ly"构成的，例如：slowly,
heavily,
truly,
terribly等。

形容词变副词：
①.在形容词词尾直接加-ly。

如:real-really;
helpful-helpfully;
careful-carefully;
slow-slowly;
quick-quickly;
quiet-quietly
②.以辅音字母加y结尾的形容词要变y为i,然后再加-ly。

如:busy-busily;
angry-angrily;
easy-easily
③.某些以辅音字母加不发音的字母e结尾和以-ue结尾的形容词要先去掉e,然后再加-y或-ly。

如:terrible-terribly;
true-truly;
gentle-gently
注意:
friendly;
motherly;
lovely，weekly，lively等词是形容词而非副词。

④.英语中还有少数与形容词同形的副词，例如：daily,
early,
fast,
hard,
high,
long,
near,
straight,
well等。

请比较它们的词义和用法：
the
high
跳高项目(形容词)
to
jump
high
跳得高(副词)
a
fast
car
行得快的汽车(形容词)to drive
fast
开快车(副词)
an
early
riser
早起的人(形容词)to
get
up
early
起得早(副词)
a
straight
line直线(形容词)Go straight
ahead.
一直朝前走。

(副词)
注意：兼有两种形式的副词①.late
与lately：
late意思是"晚";
lately
意思是"最近"。

例如：You have
come
too
late.
What
you
been
doing
lately?
②.deep与deeply：
deep意思是"深"，表示空间深度;deeply时常表示感情上的深度，"深深地"。

例如：He
pushed
the
stick
deep
into
the
mud.
Even
father
was
deeply
moved
by
the
film.
③.high与highly：
high表示空间高度;highly表示程度，相当于much。

例如：The
plane
was
flying
high.
I
think
highly
of
your
opinion.
④.wide与widely：
wide表示空间宽度;widely意思是"广泛地"，"在许多地方"。

例如：He opened
the
door wide. English
is
widely used
in
the world.。