I could reinvestigate you could reinvestigate he could reinvestigate we could reinvestigate you could reinvestigate they could reinvestigate
V-ing form
I could be reinvestigating you could be reinvestigating he could be reinvestigating we could be reinvestigating you could be reinvestigating they could be reinvestigating
Perfect
I could have reinvestigated you could have reinvestigated he could have reinvestigated we could have reinvestigated you could have reinvestigated they could have reinvestigated
V-ing perfect
I could have been reinvestigating you could have been reinvestigating he could have been reinvestigating we could have been reinvestigating you could have been reinvestigating they could have been reinvestigating
Negation
Simple form
I couldn't reinvestigate you couldn't reinvestigate he couldn't reinvestigate we couldn't reinvestigate you couldn't reinvestigate they couldn't reinvestigate
V-ing form
I couldn't be reinvestigating you couldn't be reinvestigating he couldn't be reinvestigating we couldn't be reinvestigating you couldn't be reinvestigating they couldn't be reinvestigating
Perfect
I couldn't have reinvestigated you couldn't have reinvestigated he couldn't have reinvestigated we couldn't have reinvestigated you couldn't have reinvestigated they couldn't have reinvestigated
V-ing perfect
I couldn't have been reinvestigating you couldn't have been reinvestigating he couldn't have been reinvestigating we couldn't have been reinvestigating you couldn't have been reinvestigating they couldn't have been reinvestigating
Interrogative form
Simple form
could I reinvestigate? could you reinvestigate? could he reinvestigate? could we reinvestigate? could you reinvestigate? could they reinvestigate?
V-ing form
could I be reinvestigating? could you be reinvestigating? could he be reinvestigating? could we be reinvestigating? could you be reinvestigating? could they be reinvestigating?
Perfect
could I have reinvestigated? could you have reinvestigated? could he have reinvestigated? could we have reinvestigated? could you have reinvestigated? could they have reinvestigated?
V-ing perfect
could I have been reinvestigating? could you have been reinvestigating? could he have been reinvestigating? could we have been reinvestigating? could you have been reinvestigating? could they have been reinvestigating?
Interro-negative form
Simple form
couldn't I reinvestigate? couldn't you reinvestigate? couldn't he reinvestigate? couldn't we reinvestigate? couldn't you reinvestigate? couldn't they reinvestigate?
V-ing form
couldn't I be reinvestigating? couldn't you be reinvestigating? couldn't he be reinvestigating? couldn't we be reinvestigating? couldn't you be reinvestigating? couldn't they be reinvestigating?
Perfect
couldn't I have reinvestigated? couldn't you have reinvestigated? couldn't he have reinvestigated? couldn't we have reinvestigated? couldn't you have reinvestigated? couldn't they have reinvestigated?
V-ing perfect
couldn't I have been reinvestigating? couldn't you have been reinvestigating? couldn't he have been reinvestigating? couldn't we have been reinvestigating? couldn't you have been reinvestigating? couldn't they have been reinvestigating?