用作不及物动词
▲S+～(+A)
He was constantly fretting about their financial situation.他总是为他们的经济状况苦恼。
用作及物动词
▲S+～+n./pron.
You mustn't fret your life away!你决不能在烦闷中了此一生！

She gets in a fret whenever we're late.我们只要一迟到，她就焦虑不安。