I could boom you could boom he could boom we could boom you could boom they could boom
Forme en V-ing
I could be booming you could be booming he could be booming we could be booming you could be booming they could be booming
Perfect
I could have boomed you could have boomed he could have boomed we could have boomed you could have boomed they could have boomed
Perfect en V-ing
I could have been booming you could have been booming he could have been booming we could have been booming you could have been booming they could have been booming
Négation
Forme simple
I could not boom you could not boom he could not boom we could not boom you could not boom they could not boom
Forme en V-ing
I could not be booming you could not be booming he could not be booming we could not be booming you could not be booming they could not be booming
Perfect
I could not have boomed you could not have boomed he could not have boomed we could not have boomed you could not have boomed they could not have boomed
Perfect en V-ing
I could not have been booming you could not have been booming he could not have been booming we could not have been booming you could not have been booming they could not have been booming
Forme interrogative
Forme simple
could I boom? could you boom? could he boom? could we boom? could you boom? could they boom?
Forme en V-ing
could I be booming? could you be booming? could he be booming? could we be booming? could you be booming? could they be booming?
Perfect
could I have boomed? could you have boomed? could he have boomed? could we have boomed? could you have boomed? could they have boomed?
Perfect en V-ing
could I have been booming? could you have been booming? could he have been booming? could we have been booming? could you have been booming? could they have been booming?
Forme interro-négative
Forme simple
could I not boom? could you not boom? could he not boom? could we not boom? could you not boom? could they not boom?
Forme en V-ing
could I not be booming? could you not be booming? could he not be booming? could we not be booming? could you not be booming? could they not be booming?
Perfect
could I not have boomed? could you not have boomed? could he not have boomed? could we not have boomed? could you not have boomed? could they not have boomed?
Perfect en V-ing
could I not have been booming? could you not have been booming? could he not have been booming? could we not have been booming? could you not have been booming? could they not have been booming?