The 'Re-' Prefix

As a rule, the prefix "re" (meaning "again") should not be followed by a hyphen. However, a few words require the hyphen to distinguish them from other words with the same spelling but different meaning.

For example:

A recreation program for employees
A re-creation of the original sketches
To recover from an illness
To re-cover a chair
To resign the position
To re-sign the contracts

Which is the correct word spelling?

1. to (repress re-press) one's emotions
2. to (release re-lease) the apartment
3. to (re-sort resort) to violence
4. as he (remarked re-marked) to me

Answers:

1. to repress one's emotions
2. to re-lease the apartment
3. to resort to violence
4. as he remarked to me

From: http://www.basic-learning.com/