could defragment
Regular verb: defragment - defragmented- defragmented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could defragment
you could defragment
he could defragment
we could defragment
you could defragment
they could defragment 	I could be defragmenting
you could be defragmenting
he could be defragmenting
we could be defragmenting
you could be defragmenting
they could be defragmenting	I could have defragmented
you could have defragmented
he could have defragmented
we could have defragmented
you could have defragmented
they could have defragmented	I could have been defragmenting
you could have been defragmenting
he could have been defragmenting
we could have been defragmenting
you could have been defragmenting
they could have been defragmenting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't defragment
you couldn't defragment
he couldn't defragment
we couldn't defragment
you couldn't defragment
they couldn't defragment 	I couldn't be defragmenting
you couldn't be defragmenting
he couldn't be defragmenting
we couldn't be defragmenting
you couldn't be defragmenting
they couldn't be defragmenting	I couldn't have defragmented
you couldn't have defragmented
he couldn't have defragmented
we couldn't have defragmented
you couldn't have defragmented
they couldn't have defragmented	I couldn't have been defragmenting
you couldn't have been defragmenting
he couldn't have been defragmenting
we couldn't have been defragmenting
you couldn't have been defragmenting
they couldn't have been defragmenting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I defragment?
could you defragment?
could he defragment?
could we defragment?
could you defragment?
could they defragment? 	could I be defragmenting?
could you be defragmenting?
could he be defragmenting?
could we be defragmenting?
could you be defragmenting?
could they be defragmenting? 	could I have defragmented?
could you have defragmented?
could he have defragmented?
could we have defragmented?
could you have defragmented?
could they have defragmented? 	could I have been defragmenting?
could you have been defragmenting?
could he have been defragmenting?
could we have been defragmenting?
could you have been defragmenting?
could they have been defragmenting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I defragment?
couldn't you defragment?
couldn't he defragment?
couldn't we defragment?
couldn't you defragment?
couldn't they defragment? 	couldn't I be defragmenting?
couldn't you be defragmenting?
couldn't he be defragmenting?
couldn't we be defragmenting?
couldn't you be defragmenting?
couldn't they be defragmenting? 	couldn't I have defragmented?
couldn't you have defragmented?
couldn't he have defragmented?
couldn't we have defragmented?
couldn't you have defragmented?
couldn't they have defragmented? 	couldn't I have been defragmenting?
couldn't you have been defragmenting?
couldn't he have been defragmenting?
couldn't we have been defragmenting?
couldn't you have been defragmenting?
couldn't they have been defragmenting?