501. It’s nothing that you should worry about.
507. I’m a musician and I often don’t have regular jobs.
508. I’m good at English and history, but I’m really awful at the natural sciences.
510. I know I’m being silly, but I’ll worry about her for the rest of my life.
可以采用升調, 聽的人就知道句子還未講完. 降調用於句末, 表示句子說完了.
升調還用在"yes/no"的問句中,例如: are you OK? Is this seat taken?