email--There is no hyphen, and the "e" is lowercased.
each--This pronoun is singular and implies "one" even when not
followed by the word "one." Plural words used in modifying phrases after
each do not change the number.
Each has his own reasons. Each of the
girls has her own reasons.
When each appears after a plural subject to which it refers, the verb
should be plural.
Bill and Jack each have their own reasons.
economic, economical--Economic applies to material wealth and
to business or household enterprise. Economical means "prudent in
management," "not wasteful," "thrifty." Thus, say "economic resources"
but "economical management" or "economic problems" but
effect -- See affect.
e.g. -- See i.e.
either . . . or, neither . . . nor--Either means "one of two";
neither means "not one of two." Or goes with either;
nor, with neither.
Either Sarah or I will go, but
neither Bill nor Jan will."
When used alone, both either and neither take verbs in the Either is ready to go with you. Neither is now ready.
eminent, imminent--Eminent (pronounced "EM-uh-nuhnt") means
"distinguished," "high in rank," "noteworthy."
Imminent (pronounced "IM-uh-nuhnt") means "about to occur,"
An eminent statesman.
An imminent rain squall.
ensure -- See assure.
etc.--A series introduced by "such as" or "e.g." should not be
followed by etc. because the phrases, taken together, are redundant. The
term etc. in a series is often vague and should be eliminated or replaced
with more specific terms.
extrapolate -- See interpolate.