I could double-check you could double-check she could double-check we could double-check you could double-check they could double-check
Forme en V-ing
I could be double-checking you could be double-checking she could be double-checking we could be double-checking you could be double-checking they could be double-checking
Perfect
I could have double-checked you could have double-checked she could have double-checked we could have double-checked you could have double-checked they could have double-checked
Perfect en V-ing
I could have been double-checking you could have been double-checking she could have been double-checking we could have been double-checking you could have been double-checking they could have been double-checking
Négation
Forme simple
I couldn't double-check you couldn't double-check she couldn't double-check we couldn't double-check you couldn't double-check they couldn't double-check
Forme en V-ing
I couldn't be double-checking you couldn't be double-checking she couldn't be double-checking we couldn't be double-checking you couldn't be double-checking they couldn't be double-checking
Perfect
I couldn't have double-checked you couldn't have double-checked she couldn't have double-checked we couldn't have double-checked you couldn't have double-checked they couldn't have double-checked
Perfect en V-ing
I couldn't have been double-checking you couldn't have been double-checking she couldn't have been double-checking we couldn't have been double-checking you couldn't have been double-checking they couldn't have been double-checking
Forme interrogative
Forme simple
could I double-check? could you double-check? could she double-check? could we double-check? could you double-check? could they double-check?
Forme en V-ing
could I be double-checking? could you be double-checking? could she be double-checking? could we be double-checking? could you be double-checking? could they be double-checking?
Perfect
could I have double-checked? could you have double-checked? could she have double-checked? could we have double-checked? could you have double-checked? could they have double-checked?
Perfect en V-ing
could I have been double-checking? could you have been double-checking? could she have been double-checking? could we have been double-checking? could you have been double-checking? could they have been double-checking?
Forme interro-négative
Forme simple
couldn't I double-check? couldn't you double-check? couldn't she double-check? couldn't we double-check? couldn't you double-check? couldn't they double-check?
Forme en V-ing
couldn't I be double-checking? couldn't you be double-checking? couldn't she be double-checking? couldn't we be double-checking? couldn't you be double-checking? couldn't they be double-checking?
Perfect
couldn't I have double-checked? couldn't you have double-checked? couldn't she have double-checked? couldn't we have double-checked? couldn't you have double-checked? couldn't they have double-checked?
Perfect en V-ing
couldn't I have been double-checking? couldn't you have been double-checking? couldn't she have been double-checking? couldn't we have been double-checking? couldn't you have been double-checking? couldn't they have been double-checking?