could pattern
Regular verb: pattern - patterned- patterned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pattern
you could pattern
she could pattern
we could pattern
you could pattern
they could pattern 	I could be patterning
you could be patterning
she could be patterning
we could be patterning
you could be patterning
they could be patterning	I could have patterned
you could have patterned
she could have patterned
we could have patterned
you could have patterned
they could have patterned	I could have been patterning
you could have been patterning
she could have been patterning
we could have been patterning
you could have been patterning
they could have been patterning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't pattern
you couldn't pattern
she couldn't pattern
we couldn't pattern
you couldn't pattern
they couldn't pattern 	I couldn't be patterning
you couldn't be patterning
she couldn't be patterning
we couldn't be patterning
you couldn't be patterning
they couldn't be patterning	I couldn't have patterned
you couldn't have patterned
she couldn't have patterned
we couldn't have patterned
you couldn't have patterned
they couldn't have patterned	I couldn't have been patterning
you couldn't have been patterning
she couldn't have been patterning
we couldn't have been patterning
you couldn't have been patterning
they couldn't have been patterning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pattern?
could you pattern?
could she pattern?
could we pattern?
could you pattern?
could they pattern? 	could I be patterning?
could you be patterning?
could she be patterning?
could we be patterning?
could you be patterning?
could they be patterning? 	could I have patterned?
could you have patterned?
could she have patterned?
could we have patterned?
could you have patterned?
could they have patterned? 	could I have been patterning?
could you have been patterning?
could she have been patterning?
could we have been patterning?
could you have been patterning?
could they have been patterning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I pattern?
couldn't you pattern?
couldn't she pattern?
couldn't we pattern?
couldn't you pattern?
couldn't they pattern? 	couldn't I be patterning?
couldn't you be patterning?
couldn't she be patterning?
couldn't we be patterning?
couldn't you be patterning?
couldn't they be patterning? 	couldn't I have patterned?
couldn't you have patterned?
couldn't she have patterned?
couldn't we have patterned?
couldn't you have patterned?
couldn't they have patterned? 	couldn't I have been patterning?
couldn't you have been patterning?
couldn't she have been patterning?
couldn't we have been patterning?
couldn't you have been patterning?
couldn't they have been patterning?