I could toggle you could toggle she could toggle we could toggle you could toggle they could toggle
V-ing form
I could be toggling you could be toggling she could be toggling we could be toggling you could be toggling they could be toggling
Perfect
I could have toggled you could have toggled she could have toggled we could have toggled you could have toggled they could have toggled
V-ing perfect
I could have been toggling you could have been toggling she could have been toggling we could have been toggling you could have been toggling they could have been toggling
Negation
Simple form
I couldn't toggle you couldn't toggle she couldn't toggle we couldn't toggle you couldn't toggle they couldn't toggle
V-ing form
I couldn't be toggling you couldn't be toggling she couldn't be toggling we couldn't be toggling you couldn't be toggling they couldn't be toggling
Perfect
I couldn't have toggled you couldn't have toggled she couldn't have toggled we couldn't have toggled you couldn't have toggled they couldn't have toggled
V-ing perfect
I couldn't have been toggling you couldn't have been toggling she couldn't have been toggling we couldn't have been toggling you couldn't have been toggling they couldn't have been toggling
Interrogative form
Simple form
could I toggle? could you toggle? could she toggle? could we toggle? could you toggle? could they toggle?
V-ing form
could I be toggling? could you be toggling? could she be toggling? could we be toggling? could you be toggling? could they be toggling?
Perfect
could I have toggled? could you have toggled? could she have toggled? could we have toggled? could you have toggled? could they have toggled?
V-ing perfect
could I have been toggling? could you have been toggling? could she have been toggling? could we have been toggling? could you have been toggling? could they have been toggling?
Interro-negative form
Simple form
couldn't I toggle? couldn't you toggle? couldn't she toggle? couldn't we toggle? couldn't you toggle? couldn't they toggle?
V-ing form
couldn't I be toggling? couldn't you be toggling? couldn't she be toggling? couldn't we be toggling? couldn't you be toggling? couldn't they be toggling?
Perfect
couldn't I have toggled? couldn't you have toggled? couldn't she have toggled? couldn't we have toggled? couldn't you have toggled? couldn't they have toggled?
V-ing perfect
couldn't I have been toggling? couldn't you have been toggling? couldn't she have been toggling? couldn't we have been toggling? couldn't you have been toggling? couldn't they have been toggling?