forty才是四十正确的拼写。
英［?f?ti]美［?f?rti]
n.四十；四十几。
［例句］They would have been married?forty?years come this?June.
到今年六月他们结婚就有四十年了。
［其他］复数：forties。
近义词
twoscore
英 ['tu:'sk?:(r)]美 ['tu:'sk?:(r)]
adj.四十的。
n.四十。
［例句］A similar shock was administered to National Guardsmen some twoscore years later.
大约四十年后，国民警卫队也遭受了类似的打击。