has given是什么时态

　　An electric wheelchair has given her greater mobility。

　　电动轮椅使她更便于移动了。

　　The government has given top priority to reforming the tax system。

　　政府优先致力于税制改革。

　　Management has given a pledge that there will be no job losses this year。

　　资方保证今年不会削减工作职位。