I could spit you could spit she could spit we could spit you could spit they could spit
V-ing form
I could be spitting you could be spitting she could be spitting we could be spitting you could be spitting they could be spitting
Perfect
I could have spit you could have spit she 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 she 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 she 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 she 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 she 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 she 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 she spit? could we spit? could you spit? could they spit?
V-ing form
could I be spitting? could you be spitting? could she be spitting? could we be spitting? could you be spitting? could they be spitting?
Perfect
could I have spit? could you have spit? could she 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 she 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 she 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 she 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 she 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 she have been spitting? couldn't we have been spitting? couldn't you have been spitting? couldn't they have been spitting?