200 English Grammar Mistakes!: A workbook of Common Grammar and Punctuation Errors with Examples, Exercises and Solutions So You Never Make Them Again

one’s
an elementary school teacher before he realized
politics was his true dream.
The apartment mates saw each other 
one’s
every three
months, yet they quarreled like cat and mouse.
It is more important to pursue 
once 
dream in life, lest one
end up unsatisfied.
I believe 
once 
family is more important than the billions of
dollars to be made from business trips.
Correct: 
He was 
once
an elementary school teacher before he realized
politics was his true dream.
The apartment mates saw each other 
once
every three months, yet
they quarreled like cat and mouse.
It is important that one pursue 
one’s
dream in life, lest one end up
unsatisfied.
I believe 
one’s
family is more important than the billions of
dollars to be made from business trips.
Avoid the error of Too/Two
This basically is an example of homophone. As a learner, it is useful to get
used to word inflections such as knowing that the word 
too
is used in a
sentence to emphasize a point. It can also be used instead of words like
“very” and “also.” For example: “We walked too/very slowly and missed the
bus.” Another case would be to say, “I’d like to shake hands with the
governor too/also.”
The word 
two
is separate. Two is a number or a figure expressed in words.
You should never substitute “too” for “two” in a sentence.

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Incorrect: Mark my words, the 
too
men are to blame if he doesn’t come.
It is uncertain if I’ll want to go 
two
.
Correct: 
Mark my words; the
 two
men are to blame if he doesn’t come.
It is uncertain if I’ll want to go 
too
.
Confusion with Through/Threw
This can be confusing at times if you don’t know which word is appropriate
for a particular sentence. Actually, where confusion lies in these two words is
in the "-th” pronunciation, and this shouldn’t be a problem anymore once you
can familiarize yourself with the words right here and now. 
Incorrect: The dog went