i.e., e.g.--i.e. means "that is." e.g. means "for example."
A comma always follows each (i.e., e.g.,) Their English equivalents are
preferred to avoid misunderstanding.
if, whether -- See whether, if.
imminent -- See eminent.
imply, infer--Imply means "to suggest." Infer means "to
deduce," "to guess," "to conclude."
His tie and shirt colors imply (suggest) that he is
colorblind. He is not colorblind, so we infer (surmise) that he merely
has wretched taste.
include -- See compose.
insure -- See assure.
Internet--a large computer network linking smaller computer networks
worldwide. The Internet is usually capitalized. Properly speaking, "Internet"
refers only to the hardware of the network. In common parlance, it is often
incorrectly used to describe the information sources (such as hypertext
documents and databases) that reside on servers linked through the Internet
(e.g., "I looked up that information on the Internet).
interpolate, extrapolate--Interpolate means "to insert or
introduce between other things or parts." Extrapolate means "to infer or
estimate (unknown information) by extending or projecting known information."
You interpolate between two known values. You extrapolate
from the values of a known series.
irregardless -- Use regardless.
its, it's--The possessive form of "it" is its. Its is a
possessive like his, her, your.
Its value cannot be measured.
The contraction of "it is" is it's.