must fertilise
Regular verb: fertilise - fertilised- fertilised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fertilise
you must fertilise
he must fertilise
we must fertilise
you must fertilise
they must fertilise 	I must be fertilising
you must be fertilising
he must be fertilising
we must be fertilising
you must be fertilising
they must be fertilising	I must have fertilised
you must have fertilised
he must have fertilised
we must have fertilised
you must have fertilised
they must have fertilised	I must have been fertilising
you must have been fertilising
he must have been fertilising
we must have been fertilising
you must have been fertilising
they must have been fertilising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not fertilise
you must not fertilise
he must not fertilise
we must not fertilise
you must not fertilise
they must not fertilise 	I must not be fertilising
you must not be fertilising
he must not be fertilising
we must not be fertilising
you must not be fertilising
they must not be fertilising	I must not have fertilised
you must not have fertilised
he must not have fertilised
we must not have fertilised
you must not have fertilised
they must not have fertilised	I must not have been fertilising
you must not have been fertilising
he must not have been fertilising
we must not have been fertilising
you must not have been fertilising
they must not have been fertilising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fertilise?
must you fertilise?
must he fertilise?
must we fertilise?
must you fertilise?
must they fertilise? 	must I be fertilising?
must you be fertilising?
must he be fertilising?
must we be fertilising?
must you be fertilising?
must they be fertilising? 	must I have fertilised?
must you have fertilised?
must he have fertilised?
must we have fertilised?
must you have fertilised?
must they have fertilised? 	must I have been fertilising?
must you have been fertilising?
must he have been fertilising?
must we have been fertilising?
must you have been fertilising?
must they have been fertilising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not fertilise?
must you not fertilise?
must he not fertilise?
must we not fertilise?
must you not fertilise?
must they not fertilise? 	must I not be fertilising?
must you not be fertilising?
must he not be fertilising?
must we not be fertilising?
must you not be fertilising?
must they not be fertilising? 	must I not have fertilised?
must you not have fertilised?
must he not have fertilised?
must we not have fertilised?
must you not have fertilised?
must they not have fertilised? 	must I not have been fertilising?
must you not have been fertilising?
must he not have been fertilising?
must we not have been fertilising?
must you not have been fertilising?
must they not have been fertilising?