English verb conjugation
COULD DEVELOP

Regular verb: develop - developed - developed

Affirmation

Simple form	V-ing form
I could develop you could develop he could develop we could develop you could develop they could develop	I could be developing you could be developing he could be developing we could be developing you could be developing they could be developing
Perfect	V-ing perfect
I could have developed you could have developed he could have developed we could have developed you could have developed they could have developed	I could have been developing you could have been developing he could have been developing we could have been developing you could have been developing they could have been developing

Negation

Simple form	V-ing form
I couldn't develop you couldn't develop he couldn't develop we couldn't develop you couldn't develop they couldn't develop	I couldn't be developing you couldn't be developing he couldn't be developing we couldn't be developing you couldn't be developing they couldn't be developing
Perfect	V-ing perfect
I couldn't have developed you couldn't have developed he couldn't have developed we couldn't have developed you couldn't have developed they couldn't have developed	I couldn't have been developing you couldn't have been developing he couldn't have been developing we couldn't have been developing you couldn't have been developing they couldn't have been developing

Interrogative form

Simple form	V-ing form
could I develop? could you develop? could he develop? could we develop? could you develop? could they develop?	could I be developing? could you be developing? could he be developing? could we be developing? could you be developing? could they be developing?
Perfect	V-ing perfect
could I have developed? could you have developed? could he have developed? could we have developed? could you have developed? could they have developed?	could I have been developing? could you have been developing? could he have been developing? could we have been developing? could you have been developing? could they have been developing?

Interro-negative form

Simple form	V-ing form
couldn't I develop? couldn't you develop? couldn't he develop? couldn't we develop? couldn't you develop? couldn't they develop?	couldn't I be developing? couldn't you be developing? couldn't he be developing? couldn't we be developing? couldn't you be developing? couldn't they be developing?
Perfect	V-ing perfect
couldn't I have developed? couldn't you have developed? couldn't he have developed? couldn't we have developed? couldn't you have developed? couldn't they have developed?	couldn't I have been developing? couldn't you have been developing? couldn't he have been developing? couldn't we have been developing? couldn't you have been developing? couldn't they have been developing?