English verb conjugation
COULD PAT

Regular verb: pat - patted - patted

Affirmation

Simple form	V-ing form
I could pat you could pat he could pat we could pat you could pat they could pat	I could be patting you could be patting he could be patting we could be patting you could be patting they could be patting
Perfect	V-ing perfect
I could have patted you could have patted he could have patted we could have patted you could have patted they could have patted	I could have been patting you could have been patting he could have been patting we could have been patting you could have been patting they could have been patting

Negation

Simple form	V-ing form
I couldn't pat you couldn't pat he couldn't pat we couldn't pat you couldn't pat they couldn't pat	I couldn't be patting you couldn't be patting he couldn't be patting we couldn't be patting you couldn't be patting they couldn't be patting
Perfect	V-ing perfect
I couldn't have patted you couldn't have patted he couldn't have patted we couldn't have patted you couldn't have patted they couldn't have patted	I couldn't have been patting you couldn't have been patting he couldn't have been patting we couldn't have been patting you couldn't have been patting they couldn't have been patting

Interrogative form

Simple form	V-ing form
could I pat? could you pat? could he pat? could we pat? could you pat? could they pat?	could I be patting? could you be patting? could he be patting? could we be patting? could you be patting? could they be patting?
Perfect	V-ing perfect
could I have patted? could you have patted? could he have patted? could we have patted? could you have patted? could they have patted?	could I have been patting? could you have been patting? could he have been patting? could we have been patting? could you have been patting? could they have been patting?

Interro-negative form

Simple form	V-ing form
couldn't I pat? couldn't you pat? couldn't he pat? couldn't we pat? couldn't you pat? couldn't they pat?	couldn't I be patting? couldn't you be patting? couldn't he be patting? couldn't we be patting? couldn't you be patting? couldn't they be patting?
Perfect	V-ing perfect
couldn't I have patted? couldn't you have patted? couldn't he have patted? couldn't we have patted? couldn't you have patted? couldn't they have patted?	couldn't I have been patting? couldn't you have been patting? couldn't he have been patting? couldn't we have been patting? couldn't you have been patting? couldn't they have been patting?