estaban fumigando
-they/you were fumigating
Imperfecto progresivo para el sujetoellos/ellas/ustedesdel verbofumigar.

fumigar

Hace menos de dos semanas anduve por Jinotega y Matagalpa y me encontré a funcionarios del INTA (Instituto Nicaragüense de Tecnología Agropecuaria) que estaban fumigando en un barrio de la ciudad en la campaña contra el mosquito del dengue.
Less than two weeks ago I was in Jinotega and I ran into officials from the Nicaraguan Institute of Agricultural Technology (INTA) who were fumigating in one barrio of the city as part of the campaign against the dengue mosquito.
Palabra del día
el hada madrina