Regular verb: alter alter - alter altered - alter altered
Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could alter alter you could alter alter he could alter alter we could alter alter you could alter alter they could alter alter
V-ing form
I could be alter altering you could be alter altering he could be alter altering we could be alter altering you could be alter altering they could be alter altering
Perfect
I could have alter altered you could have alter altered he could have alter altered we could have alter altered you could have alter altered they could have alter altered
V-ing perfect
I could have been alter altering you could have been alter altering he could have been alter altering we could have been alter altering you could have been alter altering they could have been alter altering
Negation
Simple form
I couldn't alter alter you couldn't alter alter he couldn't alter alter we couldn't alter alter you couldn't alter alter they couldn't alter alter
V-ing form
I couldn't be alter altering you couldn't be alter altering he couldn't be alter altering we couldn't be alter altering you couldn't be alter altering they couldn't be alter altering
Perfect
I couldn't have alter altered you couldn't have alter altered he couldn't have alter altered we couldn't have alter altered you couldn't have alter altered they couldn't have alter altered
V-ing perfect
I couldn't have been alter altering you couldn't have been alter altering he couldn't have been alter altering we couldn't have been alter altering you couldn't have been alter altering they couldn't have been alter altering
Interrogative form
Simple form
could I alter alter? could you alter alter? could he alter alter? could we alter alter? could you alter alter? could they alter alter?
V-ing form
could I be alter altering? could you be alter altering? could he be alter altering? could we be alter altering? could you be alter altering? could they be alter altering?
Perfect
could I have alter altered? could you have alter altered? could he have alter altered? could we have alter altered? could you have alter altered? could they have alter altered?
V-ing perfect
could I have been alter altering? could you have been alter altering? could he have been alter altering? could we have been alter altering? could you have been alter altering? could they have been alter altering?
Interro-negative form
Simple form
couldn't I alter alter? couldn't you alter alter? couldn't he alter alter? couldn't we alter alter? couldn't you alter alter? couldn't they alter alter?
V-ing form
couldn't I be alter altering? couldn't you be alter altering? couldn't he be alter altering? couldn't we be alter altering? couldn't you be alter altering? couldn't they be alter altering?
Perfect
couldn't I have alter altered? couldn't you have alter altered? couldn't he have alter altered? couldn't we have alter altered? couldn't you have alter altered? couldn't they have alter altered?
V-ing perfect
couldn't I have been alter altering? couldn't you have been alter altering? couldn't he have been alter altering? couldn't we have been alter altering? couldn't you have been alter altering? couldn't they have been alter altering?