Is there imperfect tense in this phrase? It needs to have ser +yo form +imperfect tense does the phrase have that?

Yo era isimo rápido de niño.
I was super fast as a kid.

they need to keep water moving over their gills so they seem to have active periods and restful periods instead of undergoing deep  sleep.  they sleep swim

explanation:

read the following texts. text 1 electoral marketing consists of implementing integrated political marketing and social communication techniques, in order to gain the approval and sympathy of the society, building a solid image of the candidate and being able to transmit reliability and safety to the population by raising its concept at the level of public opinion. therefore, electoral marketing is concerned with the formation of the image in the short term. catarin, roberto bianchi. electoral propaganda in media democracy: the victory of emotion in the 2014 presidential election in brazil. 2016. dissertation (masters in communication) - school of communication, education and humanities, methodist university of são paulo, são paulo, 2016 (158 p.)