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
she could commence
we could commence
you could commence
they could commence 	I could be commencing
you could be commencing
she could be commencing
we could be commencing
you could be commencing
they could be commencing	I could have commenced
you could have commenced
she 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
she 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
she 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
she 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
she 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
she 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 she commence?
could we commence?
could you commence?
could they commence? 	could I be commencing?
could you be commencing?
could she be commencing?
could we be commencing?
could you be commencing?
could they be commencing? 	could I have commenced?
could you have commenced?
could she 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 she 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 she 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 she 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 she 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 she have been commencing?
couldn't we have been commencing?
couldn't you have been commencing?
couldn't they have been commencing?