has given是什么時態(tài)

　　An electric wheelchair has given her greater mobility。

　　電動輪椅使她更便于移動了。

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

　　政府優(yōu)先致力于稅制改革。

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

　　資方保證今年不會削減工作職位。