English verb conjugation
COULD TAB

Regular verb: tab - tabed - tabed

Affirmation

Simple form	V-ing form
I could tab you could tab she could tab we could tab you could tab they could tab	I could be tabing you could be tabing she could be tabing we could be tabing you could be tabing they could be tabing
Perfect	V-ing perfect
I could have tabed you could have tabed she could have tabed we could have tabed you could have tabed they could have tabed	I could have been tabing you could have been tabing she could have been tabing we could have been tabing you could have been tabing they could have been tabing

Negation

Simple form	V-ing form
I couldn't tab you couldn't tab she couldn't tab we couldn't tab you couldn't tab they couldn't tab	I couldn't be tabing you couldn't be tabing she couldn't be tabing we couldn't be tabing you couldn't be tabing they couldn't be tabing
Perfect	V-ing perfect
I couldn't have tabed you couldn't have tabed she couldn't have tabed we couldn't have tabed you couldn't have tabed they couldn't have tabed	I couldn't have been tabing you couldn't have been tabing she couldn't have been tabing we couldn't have been tabing you couldn't have been tabing they couldn't have been tabing

Interrogative form

Simple form	V-ing form
could I tab? could you tab? could she tab? could we tab? could you tab? could they tab?	could I be tabing? could you be tabing? could she be tabing? could we be tabing? could you be tabing? could they be tabing?
Perfect	V-ing perfect
could I have tabed? could you have tabed? could she have tabed? could we have tabed? could you have tabed? could they have tabed?	could I have been tabing? could you have been tabing? could she have been tabing? could we have been tabing? could you have been tabing? could they have been tabing?

Interro-negative form

Simple form	V-ing form
couldn't I tab? couldn't you tab? couldn't she tab? couldn't we tab? couldn't you tab? couldn't they tab?	couldn't I be tabing? couldn't you be tabing? couldn't she be tabing? couldn't we be tabing? couldn't you be tabing? couldn't they be tabing?
Perfect	V-ing perfect
couldn't I have tabed? couldn't you have tabed? couldn't she have tabed? couldn't we have tabed? couldn't you have tabed? couldn't they have tabed?	couldn't I have been tabing? couldn't you have been tabing? couldn't she have been tabing? couldn't we have been tabing? couldn't you have been tabing? couldn't they have been tabing?