could commence
Verbo regular: commence - commenced- commenced

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could commence
you could commence
he could commence
we could commence
you could commence
they could commence 	I could be commencing
you could be commencing
he could be commencing
we could be commencing
you could be commencing
they could be commencing	I could have commenced
you could have commenced
he could have commenced
we could have commenced
you could have commenced
they could have commenced	I could have been commencing
you could have been commencing
he could have been commencing
we could have been commencing
you could have been commencing
they could have been commencing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't commence
you couldn't commence
he couldn't commence
we couldn't commence
you couldn't commence
they couldn't commence 	I couldn't be commencing
you couldn't be commencing
he couldn't be commencing
we couldn't be commencing
you couldn't be commencing
they couldn't be commencing	I couldn't have commenced
you couldn't have commenced
he couldn't have commenced
we couldn't have commenced
you couldn't have commenced
they couldn't have commenced	I couldn't have been commencing
you couldn't have been commencing
he couldn't have been commencing
we couldn't have been commencing
you couldn't have been commencing
they couldn't have been commencing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I commence?
could you commence?
could he commence?
could we commence?
could you commence?
could they commence? 	could I be commencing?
could you be commencing?
could he be commencing?
could we be commencing?
could you be commencing?
could they be commencing? 	could I have commenced?
could you have commenced?
could he have commenced?
could we have commenced?
could you have commenced?
could they have commenced? 	could I have been commencing?
could you have been commencing?
could he have been commencing?
could we have been commencing?
could you have been commencing?
could they have been commencing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I commence?
couldn't you commence?
couldn't he commence?
couldn't we commence?
couldn't you commence?
couldn't they commence? 	couldn't I be commencing?
couldn't you be commencing?
couldn't he be commencing?
couldn't we be commencing?
couldn't you be commencing?
couldn't they be commencing? 	couldn't I have commenced?
couldn't you have commenced?
couldn't he have commenced?
couldn't we have commenced?
couldn't you have commenced?
couldn't they have commenced? 	couldn't I have been commencing?
couldn't you have been commencing?
couldn't he have been commencing?
couldn't we have been commencing?
couldn't you have been commencing?
couldn't they have been commencing?