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