I could mature you could mature she could mature we could mature you could mature they could mature
Forme en V-ing
I could be maturing you could be maturing she could be maturing we could be maturing you could be maturing they could be maturing
Perfect
I could have matured you could have matured she could have matured we could have matured you could have matured they could have matured
Perfect en V-ing
I could have been maturing you could have been maturing she could have been maturing we could have been maturing you could have been maturing they could have been maturing
Négation
Forme simple
I could not mature you could not mature she could not mature we could not mature you could not mature they could not mature
Forme en V-ing
I could not be maturing you could not be maturing she could not be maturing we could not be maturing you could not be maturing they could not be maturing
Perfect
I could not have matured you could not have matured she could not have matured we could not have matured you could not have matured they could not have matured
Perfect en V-ing
I could not have been maturing you could not have been maturing she could not have been maturing we could not have been maturing you could not have been maturing they could not have been maturing
Forme interrogative
Forme simple
could I mature? could you mature? could she mature? could we mature? could you mature? could they mature?
Forme en V-ing
could I be maturing? could you be maturing? could she be maturing? could we be maturing? could you be maturing? could they be maturing?
Perfect
could I have matured? could you have matured? could she have matured? could we have matured? could you have matured? could they have matured?
Perfect en V-ing
could I have been maturing? could you have been maturing? could she have been maturing? could we have been maturing? could you have been maturing? could they have been maturing?
Forme interro-négative
Forme simple
could I not mature? could you not mature? could she not mature? could we not mature? could you not mature? could they not mature?
Forme en V-ing
could I not be maturing? could you not be maturing? could she not be maturing? could we not be maturing? could you not be maturing? could they not be maturing?
Perfect
could I not have matured? could you not have matured? could she not have matured? could we not have matured? could you not have matured? could they not have matured?
Perfect en V-ing
could I not have been maturing? could you not have been maturing? could she not have been maturing? could we not have been maturing? could you not have been maturing? could they not have been maturing?