could build
Irregular verb: build - built- built

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could build
you could build
he could build
we could build
you could build
they could build 	I could be building
you could be building
he could be building
we could be building
you could be building
they could be building	I could have built
you could have built
he could have built
we could have built
you could have built
they could have built	I could have been building
you could have been building
he could have been building
we could have been building
you could have been building
they could have been building	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't build
you couldn't build
he couldn't build
we couldn't build
you couldn't build
they couldn't build 	I couldn't be building
you couldn't be building
he couldn't be building
we couldn't be building
you couldn't be building
they couldn't be building	I couldn't have built
you couldn't have built
he couldn't have built
we couldn't have built
you couldn't have built
they couldn't have built	I couldn't have been building
you couldn't have been building
he couldn't have been building
we couldn't have been building
you couldn't have been building
they couldn't have been building	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I build?
could you build?
could he build?
could we build?
could you build?
could they build? 	could I be building?
could you be building?
could he be building?
could we be building?
could you be building?
could they be building? 	could I have built?
could you have built?
could he have built?
could we have built?
could you have built?
could they have built? 	could I have been building?
could you have been building?
could he have been building?
could we have been building?
could you have been building?
could they have been building? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I build?
couldn't you build?
couldn't he build?
couldn't we build?
couldn't you build?
couldn't they build? 	couldn't I be building?
couldn't you be building?
couldn't he be building?
couldn't we be building?
couldn't you be building?
couldn't they be building? 	couldn't I have built?
couldn't you have built?
couldn't he have built?
couldn't we have built?
couldn't you have built?
couldn't they have built? 	couldn't I have been building?
couldn't you have been building?
couldn't he have been building?
couldn't we have been building?
couldn't you have been building?
couldn't they have been building?