Sentence examples for I complained from inspiring English sources

"I complained" is a correct and usable phrase in written English.
It can be used whenever someone wants to express that they expressed their dissatisfaction or annoyance about something. For example: - "I complained to the manager about the poor service I received at the restaurant." - "I complained to the teacher about the unfair grading on my essay." - "I complained to my landlord about the loud neighbors keeping me up at night." - "I complained to my boss about the unreasonable workload."