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