bubuna:
> I have been studying how to write paragraphs. I
> have read several books and all of them advise
> that the topic sentence in a paragraph should
> nither be 'too narrow' nor 'too broad'. I find it
> very difficult to how to know what makes a topic
> sentence narrow or broad.
This is a matter of the volume of a menaing and the
amount of information -- two complementary quanti-
ties. If you have a basic, even intuitive, notion
of set theory, you'll easily understand that the
narrower part of a set one needs to identify, the
more information one must provide.
For example, the sentence "This is a cat" gives lit-
tle information and is broad, because just any cat
in the world fits. But if we supply more informa-
tion, as in "This is a black cat", the meaning be-
comes narrower because only black cats qualify, and
there are much fewer black cats than cats.
Consider also this problem for children: which group
is more numerous: all cats except those cats who are
not Toms, or all Toms except those Toms who are not
cats?
J.C. Nesfield explains this concept in his "Manual
of English Grammar and Composition" (1905), although
he applies it to adjectives rather that sentecnes,
to which it can be safely extrapolated:
An adjective is a word that enlarges the mean-
ing and narrows the application of a noun.
Enlargement of a meaning is necessarily accom-
panied by a narrowing of application. This is
a vital point. Thus the noun "house," so long
as its meaning remains unenlarged, that is, so
long as no adjective is added to it, can be
applied to an almost countless number of
things called by general name of "house." But
if I add to the noun the adjective "fourth,"
the noun so enlarged can be applied to only
one house, viz. to that house which stands
fourth in a certain row or terrace.
Observe that when we enlarge the meaning of
"house" by adding "fourth," we do not alter
the meaning of "house." "Fourth house" means
all that "house" means, and more besides.
I believe you can download this old book without vi-
olating any law.
> For example: In one of the examples of a narrative
> paragraph 'aunt Fanny is amazing' is an acceptable
> topic sentence while 'my dog is really interest-
> ing' has been criticized as being vague.
Nut sure why. They want you either to add the dog's
name, to remove the unnecessary "really", or to be
more specific than declaring the dog interesting.
Any quality unusual for a dog will make it interest-
ing in a sense, so why not name it forthwith?
My dog Benny employs an interesting tactic
when chasing cats.
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