现在进行时：Thehouseisbeingbuiltrightnow.

　　Thedeskisbeingrepairedrightnow.

　　一般将来时：Thepaperwillbedoneinnextweek.

　　Themathproblemwillbeworkedoutsoon

　　一般过去时：Thepantswerewashedjustnow.

　　Theclothesweresoldamomentago.

　　过去完成时：Thehousehasbeenbuiltforayear.

　　Thearticlehasalreadybeenpulishedinthenewspaper.

　　过去进行时：Theletterswerebeingwrittenatthistimeyesterday.

　　Themeetingwasbeingheldat4o'clockyesterday.

　　希望能够帮到楼主