have和has后面加什么

　　Prices have risen alarmingly.

　　價格漲得嚇人。

　　Building costs have nosedived.

　　建筑費用猛跌下來。

　　Prices have fallen dramatically.

　　價格突然暴跌。

　　This fish has gone off.

　　這條魚已變質了。

　　Alex has already gone.

　　亞歷克斯已經走了。

　　The dog has worms.

　　這條狗體內有寄生蟲。