have和has后面加什么

　　Prices have risen alarmingly.

　　价格涨得吓人。

　　Building costs have nosedived.

　　建筑费用猛跌下来。

　　Prices have fallen dramatically.

　　价格突然暴跌。

　　This fish has gone off.

　　这条鱼已变质了。

　　Alex has already gone.

　　亚历克斯已经走了。

　　The dog has worms.

　　这条狗体内有寄生虫。