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