English verb conjugation
COULD DECEASE

Regular verb: decease - deceased - deceased

Affirmation

Simple form	V-ing form
I could decease you could decease he could decease we could decease you could decease they could decease	I could be deceasing you could be deceasing he could be deceasing we could be deceasing you could be deceasing they could be deceasing
Perfect	V-ing perfect
I could have deceased you could have deceased he could have deceased we could have deceased you could have deceased they could have deceased	I could have been deceasing you could have been deceasing he could have been deceasing we could have been deceasing you could have been deceasing they could have been deceasing

Negation

Simple form	V-ing form
I couldn't decease you couldn't decease he couldn't decease we couldn't decease you couldn't decease they couldn't decease	I couldn't be deceasing you couldn't be deceasing he couldn't be deceasing we couldn't be deceasing you couldn't be deceasing they couldn't be deceasing
Perfect	V-ing perfect
I couldn't have deceased you couldn't have deceased he couldn't have deceased we couldn't have deceased you couldn't have deceased they couldn't have deceased	I couldn't have been deceasing you couldn't have been deceasing he couldn't have been deceasing we couldn't have been deceasing you couldn't have been deceasing they couldn't have been deceasing

Interrogative form

Simple form	V-ing form
could I decease? could you decease? could he decease? could we decease? could you decease? could they decease?	could I be deceasing? could you be deceasing? could he be deceasing? could we be deceasing? could you be deceasing? could they be deceasing?
Perfect	V-ing perfect
could I have deceased? could you have deceased? could he have deceased? could we have deceased? could you have deceased? could they have deceased?	could I have been deceasing? could you have been deceasing? could he have been deceasing? could we have been deceasing? could you have been deceasing? could they have been deceasing?

Interro-negative form

Simple form	V-ing form
couldn't I decease? couldn't you decease? couldn't he decease? couldn't we decease? couldn't you decease? couldn't they decease?	couldn't I be deceasing? couldn't you be deceasing? couldn't he be deceasing? couldn't we be deceasing? couldn't you be deceasing? couldn't they be deceasing?
Perfect	V-ing perfect
couldn't I have deceased? couldn't you have deceased? couldn't he have deceased? couldn't we have deceased? couldn't you have deceased? couldn't they have deceased?	couldn't I have been deceasing? couldn't you have been deceasing? couldn't he have been deceasing? couldn't we have been deceasing? couldn't you have been deceasing? couldn't they have been deceasing?