I could monitor you could monitor she could monitor we could monitor you could monitor they could monitor
V-ing form
I could be monitoring you could be monitoring she could be monitoring we could be monitoring you could be monitoring they could be monitoring
Perfect
I could have monitored you could have monitored she could have monitored we could have monitored you could have monitored they could have monitored
V-ing perfect
I could have been monitoring you could have been monitoring she could have been monitoring we could have been monitoring you could have been monitoring they could have been monitoring
Negation
Simple form
I couldn't monitor you couldn't monitor she couldn't monitor we couldn't monitor you couldn't monitor they couldn't monitor
V-ing form
I couldn't be monitoring you couldn't be monitoring she couldn't be monitoring we couldn't be monitoring you couldn't be monitoring they couldn't be monitoring
Perfect
I couldn't have monitored you couldn't have monitored she couldn't have monitored we couldn't have monitored you couldn't have monitored they couldn't have monitored
V-ing perfect
I couldn't have been monitoring you couldn't have been monitoring she couldn't have been monitoring we couldn't have been monitoring you couldn't have been monitoring they couldn't have been monitoring
Interrogative form
Simple form
could I monitor? could you monitor? could she monitor? could we monitor? could you monitor? could they monitor?
V-ing form
could I be monitoring? could you be monitoring? could she be monitoring? could we be monitoring? could you be monitoring? could they be monitoring?
Perfect
could I have monitored? could you have monitored? could she have monitored? could we have monitored? could you have monitored? could they have monitored?
V-ing perfect
could I have been monitoring? could you have been monitoring? could she have been monitoring? could we have been monitoring? could you have been monitoring? could they have been monitoring?
Interro-negative form
Simple form
couldn't I monitor? couldn't you monitor? couldn't she monitor? couldn't we monitor? couldn't you monitor? couldn't they monitor?
V-ing form
couldn't I be monitoring? couldn't you be monitoring? couldn't she be monitoring? couldn't we be monitoring? couldn't you be monitoring? couldn't they be monitoring?
Perfect
couldn't I have monitored? couldn't you have monitored? couldn't she have monitored? couldn't we have monitored? couldn't you have monitored? couldn't they have monitored?
V-ing perfect
couldn't I have been monitoring? couldn't you have been monitoring? couldn't she have been monitoring? couldn't we have been monitoring? couldn't you have been monitoring? couldn't they have been monitoring?