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