the use of nothing implies that I know something about it. The sentence
should read--"I don't know anything about it."

Often we hear such expressions as "He was _not_ asked to give _no_
opinion," expressing the very opposite of what is intended. This sentence
implies that he was asked to give his opinion. The double negative,
therefore, should be carefully avoided, for it is insidious and is liable
to slip in and the writer remain unconscious of its presence until the
eye of the critic detects it.


FIRST PERSONAL PRONOUN

The use of the first personal pronoun should be avoided as much as
possible in composition. Don't introduce it by way of apology and never
use such expressions as "In my opinion," "As far as I can see," "It
appears to me," "I believe," etc. In what you write, the whole
composition is expressive of your views, since you are the author,
therefore, there is no necessity for you to accentuate or emphasize
yourself at certain portions of it.

Moreover, the big _I's_ savor of egotism! Steer clear of them as far as
you can. The only place where the first person is permissible is in
passages where you are stating a view that is not generally held and
which is likely to meet with opposition.


SEQUENCE OF TENSES

When two verbs depend on each other their tenses must have a definite