Fill in the Blanks Impersonal passiveOnline version Grammar activity about impersonal passive form. by Irvin Jason Rauda Velasco 1 is that was be believed believes believing will - Experts believe that there are over 200 species of owl in the world - It there are over 200 species of owl in the worl d 2 reported reporting have was be is being has to - Some people report that the owl population of some species is lower than in the past . - The owl population of some species lower than in the past . 3 has been understand understands was understood is that - Experts understand that owls can turn their head up to 270° - It owls can turn their heads up to 270 ° 4 are assuming make making is to assumed assumingly made - People assume that owls make just one sound - - a hoot - Owls just one sound - - a hoo t 5 are is making made saying to were said aren't make - In fact , experts say that owls make a variety of different sounds - Owls a variety of different sound s 6 known knew be knowking will being was know that is - Experts know some species of owl eat fish as well as mammals - It some species of owl eat fish as well as mammal s