could overfertilise
Regular verb: overfertilise - overfertilised- overfertilised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overfertilise
you could overfertilise
she could overfertilise
we could overfertilise
you could overfertilise
they could overfertilise 	I could be overfertilising
you could be overfertilising
she could be overfertilising
we could be overfertilising
you could be overfertilising
they could be overfertilising	I could have overfertilised
you could have overfertilised
she could have overfertilised
we could have overfertilised
you could have overfertilised
they could have overfertilised	I could have been overfertilising
you could have been overfertilising
she could have been overfertilising
we could have been overfertilising
you could have been overfertilising
they could have been overfertilising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not overfertilise
you could not overfertilise
she could not overfertilise
we could not overfertilise
you could not overfertilise
they could not overfertilise 	I could not be overfertilising
you could not be overfertilising
she could not be overfertilising
we could not be overfertilising
you could not be overfertilising
they could not be overfertilising	I could not have overfertilised
you could not have overfertilised
she could not have overfertilised
we could not have overfertilised
you could not have overfertilised
they could not have overfertilised	I could not have been overfertilising
you could not have been overfertilising
she could not have been overfertilising
we could not have been overfertilising
you could not have been overfertilising
they could not have been overfertilising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overfertilise?
could you overfertilise?
could she overfertilise?
could we overfertilise?
could you overfertilise?
could they overfertilise? 	could I be overfertilising?
could you be overfertilising?
could she be overfertilising?
could we be overfertilising?
could you be overfertilising?
could they be overfertilising? 	could I have overfertilised?
could you have overfertilised?
could she have overfertilised?
could we have overfertilised?
could you have overfertilised?
could they have overfertilised? 	could I have been overfertilising?
could you have been overfertilising?
could she have been overfertilising?
could we have been overfertilising?
could you have been overfertilising?
could they have been overfertilising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not overfertilise?
could you not overfertilise?
could she not overfertilise?
could we not overfertilise?
could you not overfertilise?
could they not overfertilise? 	could I not be overfertilising?
could you not be overfertilising?
could she not be overfertilising?
could we not be overfertilising?
could you not be overfertilising?
could they not be overfertilising? 	could I not have overfertilised?
could you not have overfertilised?
could she not have overfertilised?
could we not have overfertilised?
could you not have overfertilised?
could they not have overfertilised? 	could I not have been overfertilising?
could you not have been overfertilising?
could she not have been overfertilising?
could we not have been overfertilising?
could you not have been overfertilising?
could they not have been overfertilising?