must cleave
Irregular verb: cleave - cleaved, cleft, clove- cleaved, cleft, cloven

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cleave
you must cleave
he must cleave
we must cleave
you must cleave
they must cleave 	I must be cleaving
you must be cleaving
he must be cleaving
we must be cleaving
you must be cleaving
they must be cleaving	I must have cleaved, cleft, cloven
you must have cleaved, cleft, cloven
he must have cleaved, cleft, cloven
we must have cleaved, cleft, cloven
you must have cleaved, cleft, cloven
they must have cleaved, cleft, cloven	I must have been cleaving
you must have been cleaving
he must have been cleaving
we must have been cleaving
you must have been cleaving
they must have been cleaving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't cleave
you mustn't cleave
he mustn't cleave
we mustn't cleave
you mustn't cleave
they mustn't cleave 	I mustn't be cleaving
you mustn't be cleaving
he mustn't be cleaving
we mustn't be cleaving
you mustn't be cleaving
they mustn't be cleaving	I mustn't have cleaved, cleft, cloven
you mustn't have cleaved, cleft, cloven
he mustn't have cleaved, cleft, cloven
we mustn't have cleaved, cleft, cloven
you mustn't have cleaved, cleft, cloven
they mustn't have cleaved, cleft, cloven	I mustn't have been cleaving
you mustn't have been cleaving
he mustn't have been cleaving
we mustn't have been cleaving
you mustn't have been cleaving
they mustn't have been cleaving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cleave?
must you cleave?
must he cleave?
must we cleave?
must you cleave?
must they cleave? 	must I be cleaving?
must you be cleaving?
must he be cleaving?
must we be cleaving?
must you be cleaving?
must they be cleaving? 	must I have cleaved, cleft, cloven?
must you have cleaved, cleft, cloven?
must he have cleaved, cleft, cloven?
must we have cleaved, cleft, cloven?
must you have cleaved, cleft, cloven?
must they have cleaved, cleft, cloven? 	must I have been cleaving?
must you have been cleaving?
must he have been cleaving?
must we have been cleaving?
must you have been cleaving?
must they have been cleaving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I cleave?
mustn't you cleave?
mustn't he cleave?
mustn't we cleave?
mustn't you cleave?
mustn't they cleave? 	mustn't I be cleaving?
mustn't you be cleaving?
mustn't he be cleaving?
mustn't we be cleaving?
mustn't you be cleaving?
mustn't they be cleaving? 	mustn't I have cleaved, cleft, cloven?
mustn't you have cleaved, cleft, cloven?
mustn't he have cleaved, cleft, cloven?
mustn't we have cleaved, cleft, cloven?
mustn't you have cleaved, cleft, cloven?
mustn't they have cleaved, cleft, cloven? 	mustn't I have been cleaving?
mustn't you have been cleaving?
mustn't he have been cleaving?
mustn't we have been cleaving?
mustn't you have been cleaving?
mustn't they have been cleaving?