are加動(dòng)詞ing是什么時(shí)態(tài)

　　We are very sad to hear that you are leaving.

　　聽(tīng)說(shuō)你要走了，我們十分難過(guò)。

　　Here are two records that are bubbling under.

　　這兩張唱片將會(huì)走紅。

　　What are you doing? Are you out of your mind?

　　你在干什么？你瘋了嗎？