could deflate
Regular verb: deflate - deflated- deflated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could deflate
you could deflate
she could deflate
we could deflate
you could deflate
they could deflate 	I could be deflating
you could be deflating
she could be deflating
we could be deflating
you could be deflating
they could be deflating	I could have deflated
you could have deflated
she could have deflated
we could have deflated
you could have deflated
they could have deflated	I could have been deflating
you could have been deflating
she could have been deflating
we could have been deflating
you could have been deflating
they could have been deflating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't deflate
you couldn't deflate
she couldn't deflate
we couldn't deflate
you couldn't deflate
they couldn't deflate 	I couldn't be deflating
you couldn't be deflating
she couldn't be deflating
we couldn't be deflating
you couldn't be deflating
they couldn't be deflating	I couldn't have deflated
you couldn't have deflated
she couldn't have deflated
we couldn't have deflated
you couldn't have deflated
they couldn't have deflated	I couldn't have been deflating
you couldn't have been deflating
she couldn't have been deflating
we couldn't have been deflating
you couldn't have been deflating
they couldn't have been deflating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I deflate?
could you deflate?
could she deflate?
could we deflate?
could you deflate?
could they deflate? 	could I be deflating?
could you be deflating?
could she be deflating?
could we be deflating?
could you be deflating?
could they be deflating? 	could I have deflated?
could you have deflated?
could she have deflated?
could we have deflated?
could you have deflated?
could they have deflated? 	could I have been deflating?
could you have been deflating?
could she have been deflating?
could we have been deflating?
could you have been deflating?
could they have been deflating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I deflate?
couldn't you deflate?
couldn't she deflate?
couldn't we deflate?
couldn't you deflate?
couldn't they deflate? 	couldn't I be deflating?
couldn't you be deflating?
couldn't she be deflating?
couldn't we be deflating?
couldn't you be deflating?
couldn't they be deflating? 	couldn't I have deflated?
couldn't you have deflated?
couldn't she have deflated?
couldn't we have deflated?
couldn't you have deflated?
couldn't they have deflated? 	couldn't I have been deflating?
couldn't you have been deflating?
couldn't she have been deflating?
couldn't we have been deflating?
couldn't you have been deflating?
couldn't they have been deflating?