has gone down是什么时态

　　Crime has gone down 70 percent

　　犯罪率下降了70%。

　　Expenditure on health in most of these countries has gone down, and the same is true for education.

　　这些国家的医疗支出大多已经下降，教育支出也是如此。

　　The sea has gone down some.

　　海浪平息了一些。

　　The swelling has gone down a little.

　　肿消了一点。

　　The price of coloured TV sets has gone down.

　　彩电落价了。