I could screech you could screech she could screech we could screech you could screech they could screech
Forme en V-ing
I could be screeching you could be screeching she could be screeching we could be screeching you could be screeching they could be screeching
Perfect
I could have screeched you could have screeched she could have screeched we could have screeched you could have screeched they could have screeched
Perfect en V-ing
I could have been screeching you could have been screeching she could have been screeching we could have been screeching you could have been screeching they could have been screeching
Négation
Forme simple
I couldn't screech you couldn't screech she couldn't screech we couldn't screech you couldn't screech they couldn't screech
Forme en V-ing
I couldn't be screeching you couldn't be screeching she couldn't be screeching we couldn't be screeching you couldn't be screeching they couldn't be screeching
Perfect
I couldn't have screeched you couldn't have screeched she couldn't have screeched we couldn't have screeched you couldn't have screeched they couldn't have screeched
Perfect en V-ing
I couldn't have been screeching you couldn't have been screeching she couldn't have been screeching we couldn't have been screeching you couldn't have been screeching they couldn't have been screeching
Forme interrogative
Forme simple
could I screech? could you screech? could she screech? could we screech? could you screech? could they screech?
Forme en V-ing
could I be screeching? could you be screeching? could she be screeching? could we be screeching? could you be screeching? could they be screeching?
Perfect
could I have screeched? could you have screeched? could she have screeched? could we have screeched? could you have screeched? could they have screeched?
Perfect en V-ing
could I have been screeching? could you have been screeching? could she have been screeching? could we have been screeching? could you have been screeching? could they have been screeching?
Forme interro-négative
Forme simple
couldn't I screech? couldn't you screech? couldn't she screech? couldn't we screech? couldn't you screech? couldn't they screech?
Forme en V-ing
couldn't I be screeching? couldn't you be screeching? couldn't she be screeching? couldn't we be screeching? couldn't you be screeching? couldn't they be screeching?
Perfect
couldn't I have screeched? couldn't you have screeched? couldn't she have screeched? couldn't we have screeched? couldn't you have screeched? couldn't they have screeched?
Perfect en V-ing
couldn't I have been screeching? couldn't you have been screeching? couldn't she have been screeching? couldn't we have been screeching? couldn't you have been screeching? couldn't they have been screeching?