Are there any similarities or differences between modernist fiction and postmodernist fiction in subject and form? urgent!

I'm going to assume that you are referring to American
fiction, but if you are not, most of the ideas below will still
fit.

Similarities:

Modernist
and Postmodernist Fiction both stress disillusionment with traditions and ideals.  In
American Literature, this means that authors such as Steinbeck and Fitzgerald portray
the American Dream as unattainable and as a cruel
illusion.

Another similarity is that American Fiction
became more multi-cultural during both literary eras.  During the Modernist Movement in
America, the Harlem Renaissance occurred, and the rhythm of jazz and blues made its way
into poetry. In comparison, the Postmodernist Era has produced American writers from a
myriad of ethnic backgrounds.  These writers, just like those from the Harlem
Renaissance, have added richness to the culture of American
Lit.

Differences:

One
of the most significant differences between the Modernists and Postmodernists is the
theme of conformity versus individualism.  The Modernists wrote for readers who had been
through several traumatic periods (World War I, the Stock Market Crash, and the Great
Depression).  Those readers seemed to long for a sense of normalcy.  For some, that
normalcy came from Europe where so many of them had been during the war. So, while
Hemingway often wrote of far-away places, he still dealt with intensely American issues.
Likewise, poets such as Ezra Pound and T.S. Eliot introduced Imagism and Symbolism which
possessed the flowery style of past eras.

In contrast, the
Postmodernists found themselves living in a nuclear, space-traveling world. Because of
the rise of technology, Postmodernist fiction often features people struggling to
establish their individualism rather than conforming. The Beats and other
avante garde poetry strayed from the Modernist style.  Poetry
became much more personal during the Postmodernist era through the influence of poets
like Robert Lowell.

The most significant difference between
the two literary eras is the rise of nonfiction's popularity under Postmodernism. I've
seen the influence of this change simply by teaching high school English.  More and more
tests focus on students' ability to analyze nonfiction, and nonfiction bestsellers have
become just as interesting and popular as bestselling novels.