English verb conjugation
COULD TOUR

Regular verb: tour - toured - toured

Affirmation

Simple form	V-ing form
I could tour you could tour he could tour we could tour you could tour they could tour	I could be touring you could be touring he could be touring we could be touring you could be touring they could be touring
Perfect	V-ing perfect
I could have toured you could have toured he could have toured we could have toured you could have toured they could have toured	I could have been touring you could have been touring he could have been touring we could have been touring you could have been touring they could have been touring

Negation

Simple form	V-ing form
I couldn't tour you couldn't tour he couldn't tour we couldn't tour you couldn't tour they couldn't tour	I couldn't be touring you couldn't be touring he couldn't be touring we couldn't be touring you couldn't be touring they couldn't be touring
Perfect	V-ing perfect
I couldn't have toured you couldn't have toured he couldn't have toured we couldn't have toured you couldn't have toured they couldn't have toured	I couldn't have been touring you couldn't have been touring he couldn't have been touring we couldn't have been touring you couldn't have been touring they couldn't have been touring

Interrogative form

Simple form	V-ing form
could I tour? could you tour? could he tour? could we tour? could you tour? could they tour?	could I be touring? could you be touring? could he be touring? could we be touring? could you be touring? could they be touring?
Perfect	V-ing perfect
could I have toured? could you have toured? could he have toured? could we have toured? could you have toured? could they have toured?	could I have been touring? could you have been touring? could he have been touring? could we have been touring? could you have been touring? could they have been touring?

Interro-negative form

Simple form	V-ing form
couldn't I tour? couldn't you tour? couldn't he tour? couldn't we tour? couldn't you tour? couldn't they tour?	couldn't I be touring? couldn't you be touring? couldn't he be touring? couldn't we be touring? couldn't you be touring? couldn't they be touring?
Perfect	V-ing perfect
couldn't I have toured? couldn't you have toured? couldn't he have toured? couldn't we have toured? couldn't you have toured? couldn't they have toured?	couldn't I have been touring? couldn't you have been touring? couldn't he have been touring? couldn't we have been touring? couldn't you have been touring? couldn't they have been touring?