I could concern you could concern he could concern we could concern you could concern they could concern
Forme en V-ing
I could be concerning you could be concerning he could be concerning we could be concerning you could be concerning they could be concerning
Perfect
I could have concerned you could have concerned he could have concerned we could have concerned you could have concerned they could have concerned
Perfect en V-ing
I could have been concerning you could have been concerning he could have been concerning we could have been concerning you could have been concerning they could have been concerning
Négation
Forme simple
I couldn't concern you couldn't concern he couldn't concern we couldn't concern you couldn't concern they couldn't concern
Forme en V-ing
I couldn't be concerning you couldn't be concerning he couldn't be concerning we couldn't be concerning you couldn't be concerning they couldn't be concerning
Perfect
I couldn't have concerned you couldn't have concerned he couldn't have concerned we couldn't have concerned you couldn't have concerned they couldn't have concerned
Perfect en V-ing
I couldn't have been concerning you couldn't have been concerning he couldn't have been concerning we couldn't have been concerning you couldn't have been concerning they couldn't have been concerning
Forme interrogative
Forme simple
could I concern? could you concern? could he concern? could we concern? could you concern? could they concern?
Forme en V-ing
could I be concerning? could you be concerning? could he be concerning? could we be concerning? could you be concerning? could they be concerning?
Perfect
could I have concerned? could you have concerned? could he have concerned? could we have concerned? could you have concerned? could they have concerned?
Perfect en V-ing
could I have been concerning? could you have been concerning? could he have been concerning? could we have been concerning? could you have been concerning? could they have been concerning?
Forme interro-négative
Forme simple
couldn't I concern? couldn't you concern? couldn't he concern? couldn't we concern? couldn't you concern? couldn't they concern?
Forme en V-ing
couldn't I be concerning? couldn't you be concerning? couldn't he be concerning? couldn't we be concerning? couldn't you be concerning? couldn't they be concerning?
Perfect
couldn't I have concerned? couldn't you have concerned? couldn't he have concerned? couldn't we have concerned? couldn't you have concerned? couldn't they have concerned?
Perfect en V-ing
couldn't I have been concerning? couldn't you have been concerning? couldn't he have been concerning? couldn't we have been concerning? couldn't you have been concerning? couldn't they have been concerning?