complain可用作及特与不及物动词、名词或动名词、可用于进行时态。相关词组有complain bitterly痛苦地诉说、complain constantly经常地抱怨、complain about（at, of）抱怨，诉苦等。
complain用法vi. 1. 抱怨,发牢骚;诉说(病痛bai等)[(+to/about/of)]
I've really got nothing to complain of.我确实没有什么可抱怨的。
He complained to me about the food.他向我抱怨伙食不佳。
2. 控诉,投诉[(+to/about/of)]
He complained to the police of the boys stealing his apples.
他向警方控告那些男孩偷他的苹果。
vt. 1. 抱怨;控诉[Y][+that]
He complained that the exam was too hard.他抱怨考试太难了。
词组：
complain about对……不满
complain about sth 抱怨某事
complain to sb 想某人抱怨
complain that+从句 抱怨某事
complain to sb (about sth) 向某人抱怨某事
complain of sth 诉说病痛
complains box是意见箱的意思
complain of 抱怨；抗议
