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