Another common confusion is when to use the “ed” ending of an adjective (confused) versus the “ing” ending (confusing).

Another common confusion is when to use "few" and when to use "little".

We can use "appreciate" to ask and to thank. However, people often forget to add "it" when using "if" in a polite request.

A common confusion is which preposition to use in the following fixed expressions.

Sometimes it’s the little things that slow us down or trip us up, such as trying to remember if a word is spelt together or apart.

Prime candidates for confusing words are affect/effect and effective/efficient.