no why是正确的吗

　　I still have no reason to doubt his word.

　　我还是没有理由怀疑他的话。

　　There is no reason why love shouldn't cross the age barrier

　　爱没有理由不能跨越年龄的阻碍。

　　There is no reason for people to get their hopes up over this mission

　　不必对这次行动抱太大希望。