is been 是什么時態(tài)

　　She's been told that her husband is being harshly treated in prison.

　　她被告知她丈夫正在監(jiān)獄里遭受嚴酷的對待。

　　There have been riots before and the situation is volatile.

　　先前一直就有暴亂，局勢變化無常。

　　We have been given reassurances that the water is safe to drink.

　　我們得到保證說這水適合飲用。