English verb conjugation
COULD VOMIT

Regular verb: vomit - vomited - vomited

Affirmation

Simple form	V-ing form
I could vomit you could vomit he could vomit we could vomit you could vomit they could vomit	I could be vomiting you could be vomiting he could be vomiting we could be vomiting you could be vomiting they could be vomiting
Perfect	V-ing perfect
I could have vomited you could have vomited he could have vomited we could have vomited you could have vomited they could have vomited	I could have been vomiting you could have been vomiting he could have been vomiting we could have been vomiting you could have been vomiting they could have been vomiting

Negation

Simple form	V-ing form
I couldn't vomit you couldn't vomit he couldn't vomit we couldn't vomit you couldn't vomit they couldn't vomit	I couldn't be vomiting you couldn't be vomiting he couldn't be vomiting we couldn't be vomiting you couldn't be vomiting they couldn't be vomiting
Perfect	V-ing perfect
I couldn't have vomited you couldn't have vomited he couldn't have vomited we couldn't have vomited you couldn't have vomited they couldn't have vomited	I couldn't have been vomiting you couldn't have been vomiting he couldn't have been vomiting we couldn't have been vomiting you couldn't have been vomiting they couldn't have been vomiting

Interrogative form

Simple form	V-ing form
could I vomit? could you vomit? could he vomit? could we vomit? could you vomit? could they vomit?	could I be vomiting? could you be vomiting? could he be vomiting? could we be vomiting? could you be vomiting? could they be vomiting?
Perfect	V-ing perfect
could I have vomited? could you have vomited? could he have vomited? could we have vomited? could you have vomited? could they have vomited?	could I have been vomiting? could you have been vomiting? could he have been vomiting? could we have been vomiting? could you have been vomiting? could they have been vomiting?

Interro-negative form

Simple form	V-ing form
couldn't I vomit? couldn't you vomit? couldn't he vomit? couldn't we vomit? couldn't you vomit? couldn't they vomit?	couldn't I be vomiting? couldn't you be vomiting? couldn't he be vomiting? couldn't we be vomiting? couldn't you be vomiting? couldn't they be vomiting?
Perfect	V-ing perfect
couldn't I have vomited? couldn't you have vomited? couldn't he have vomited? couldn't we have vomited? couldn't you have vomited? couldn't they have vomited?	couldn't I have been vomiting? couldn't you have been vomiting? couldn't he have been vomiting? couldn't we have been vomiting? couldn't you have been vomiting? couldn't they have been vomiting?