I could snatch you could snatch he could snatch we could snatch you could snatch they could snatch
V-ing form
I could be snatching you could be snatching he could be snatching we could be snatching you could be snatching they could be snatching
Perfect
I could have snatched you could have snatched he could have snatched we could have snatched you could have snatched they could have snatched
V-ing perfect
I could have been snatching you could have been snatching he could have been snatching we could have been snatching you could have been snatching they could have been snatching
Negation
Simple form
I couldn't snatch you couldn't snatch he couldn't snatch we couldn't snatch you couldn't snatch they couldn't snatch
V-ing form
I couldn't be snatching you couldn't be snatching he couldn't be snatching we couldn't be snatching you couldn't be snatching they couldn't be snatching
Perfect
I couldn't have snatched you couldn't have snatched he couldn't have snatched we couldn't have snatched you couldn't have snatched they couldn't have snatched
V-ing perfect
I couldn't have been snatching you couldn't have been snatching he couldn't have been snatching we couldn't have been snatching you couldn't have been snatching they couldn't have been snatching
Interrogative form
Simple form
could I snatch? could you snatch? could he snatch? could we snatch? could you snatch? could they snatch?
V-ing form
could I be snatching? could you be snatching? could he be snatching? could we be snatching? could you be snatching? could they be snatching?
Perfect
could I have snatched? could you have snatched? could he have snatched? could we have snatched? could you have snatched? could they have snatched?
V-ing perfect
could I have been snatching? could you have been snatching? could he have been snatching? could we have been snatching? could you have been snatching? could they have been snatching?
Interro-negative form
Simple form
couldn't I snatch? couldn't you snatch? couldn't he snatch? couldn't we snatch? couldn't you snatch? couldn't they snatch?
V-ing form
couldn't I be snatching? couldn't you be snatching? couldn't he be snatching? couldn't we be snatching? couldn't you be snatching? couldn't they be snatching?
Perfect
couldn't I have snatched? couldn't you have snatched? couldn't he have snatched? couldn't we have snatched? couldn't you have snatched? couldn't they have snatched?
V-ing perfect
couldn't I have been snatching? couldn't you have been snatching? couldn't he have been snatching? couldn't we have been snatching? couldn't you have been snatching? couldn't they have been snatching?