Many people make the mistake of adding an "s" to words that require no "s" because they are both singular and plural. You can tell whether these words are singular or plural depending on their context.
Fish and many types of fish are both singular and plural even without an "s."
- fish - one fish or many fish
Most herd animals with the exception of cows, goats and pigs, do not need an "s" to make them plural.
Certain birds do not need an "s" to make them plural.
Surely, we have seen or heard people put an "s" on the above words, and you have probably done so yourself. Now that you know the difference, begin to use the words properly.
Can you think of other words that are written the same way whether they are singular or plural?