English verb conjugation
COULD REOBSERVE

Regular verb: reobserve - reobserved - reobserved

Affirmation

Simple form	V-ing form
I could reobserve you could reobserve he could reobserve we could reobserve you could reobserve they could reobserve	I could be reobserving you could be reobserving he could be reobserving we could be reobserving you could be reobserving they could be reobserving
Perfect	V-ing perfect
I could have reobserved you could have reobserved he could have reobserved we could have reobserved you could have reobserved they could have reobserved	I could have been reobserving you could have been reobserving he could have been reobserving we could have been reobserving you could have been reobserving they could have been reobserving

Negation

Simple form	V-ing form
I couldn't reobserve you couldn't reobserve he couldn't reobserve we couldn't reobserve you couldn't reobserve they couldn't reobserve	I couldn't be reobserving you couldn't be reobserving he couldn't be reobserving we couldn't be reobserving you couldn't be reobserving they couldn't be reobserving
Perfect	V-ing perfect
I couldn't have reobserved you couldn't have reobserved he couldn't have reobserved we couldn't have reobserved you couldn't have reobserved they couldn't have reobserved	I couldn't have been reobserving you couldn't have been reobserving he couldn't have been reobserving we couldn't have been reobserving you couldn't have been reobserving they couldn't have been reobserving

Interrogative form

Simple form	V-ing form
could I reobserve? could you reobserve? could he reobserve? could we reobserve? could you reobserve? could they reobserve?	could I be reobserving? could you be reobserving? could he be reobserving? could we be reobserving? could you be reobserving? could they be reobserving?
Perfect	V-ing perfect
could I have reobserved? could you have reobserved? could he have reobserved? could we have reobserved? could you have reobserved? could they have reobserved?	could I have been reobserving? could you have been reobserving? could he have been reobserving? could we have been reobserving? could you have been reobserving? could they have been reobserving?

Interro-negative form

Simple form	V-ing form
couldn't I reobserve? couldn't you reobserve? couldn't he reobserve? couldn't we reobserve? couldn't you reobserve? couldn't they reobserve?	couldn't I be reobserving? couldn't you be reobserving? couldn't he be reobserving? couldn't we be reobserving? couldn't you be reobserving? couldn't they be reobserving?
Perfect	V-ing perfect
couldn't I have reobserved? couldn't you have reobserved? couldn't he have reobserved? couldn't we have reobserved? couldn't you have reobserved? couldn't they have reobserved?	couldn't I have been reobserving? couldn't you have been reobserving? couldn't he have been reobserving? couldn't we have been reobserving? couldn't you have been reobserving? couldn't they have been reobserving?