What is the difference between "complain," "complaint" and "complained"?
"Complain" is a verb. It means you are unhappy with something and you express it.
For example: "I want to complain about the quality of the food."
The past form of "complain" is "complained."
For example, "I complained about the quality of the food."
"Complaint" is a noun. It's what you say or write when you are unhappy with something.
For example: "I wrote a complaint about the quality of food."
