English verb conjugation
COULD DECEASE

Regular verb: decease - deceased - deceased

Affirmation

Simple form	V-ing form
I could decease you could decease she could decease we could decease you could decease they could decease	I could be deceasing you could be deceasing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she decease? could we decease? could you decease? could they decease?	could I be deceasing? could you be deceasing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been deceasing? couldn't we have been deceasing? couldn't you have been deceasing? couldn't they have been deceasing?