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