English verb conjugation
COULD TOBOGGAN

Regular verb: toboggan - tobogganed - tobogganed

Affirmation

Simple form	V-ing form
I could toboggan you could toboggan he could toboggan we could toboggan you could toboggan they could toboggan	I could be tobogganing you could be tobogganing he could be tobogganing we could be tobogganing you could be tobogganing they could be tobogganing
Perfect	V-ing perfect
I could have tobogganed you could have tobogganed he could have tobogganed we could have tobogganed you could have tobogganed they could have tobogganed	I could have been tobogganing you could have been tobogganing he could have been tobogganing we could have been tobogganing you could have been tobogganing they could have been tobogganing

Negation

Simple form	V-ing form
I couldn't toboggan you couldn't toboggan he couldn't toboggan we couldn't toboggan you couldn't toboggan they couldn't toboggan	I couldn't be tobogganing you couldn't be tobogganing he couldn't be tobogganing we couldn't be tobogganing you couldn't be tobogganing they couldn't be tobogganing
Perfect	V-ing perfect
I couldn't have tobogganed you couldn't have tobogganed he couldn't have tobogganed we couldn't have tobogganed you couldn't have tobogganed they couldn't have tobogganed	I couldn't have been tobogganing you couldn't have been tobogganing he couldn't have been tobogganing we couldn't have been tobogganing you couldn't have been tobogganing they couldn't have been tobogganing

Interrogative form

Simple form	V-ing form
could I toboggan? could you toboggan? could he toboggan? could we toboggan? could you toboggan? could they toboggan?	could I be tobogganing? could you be tobogganing? could he be tobogganing? could we be tobogganing? could you be tobogganing? could they be tobogganing?
Perfect	V-ing perfect
could I have tobogganed? could you have tobogganed? could he have tobogganed? could we have tobogganed? could you have tobogganed? could they have tobogganed?	could I have been tobogganing? could you have been tobogganing? could he have been tobogganing? could we have been tobogganing? could you have been tobogganing? could they have been tobogganing?

Interro-negative form

Simple form	V-ing form
couldn't I toboggan? couldn't you toboggan? couldn't he toboggan? couldn't we toboggan? couldn't you toboggan? couldn't they toboggan?	couldn't I be tobogganing? couldn't you be tobogganing? couldn't he be tobogganing? couldn't we be tobogganing? couldn't you be tobogganing? couldn't they be tobogganing?
Perfect	V-ing perfect
couldn't I have tobogganed? couldn't you have tobogganed? couldn't he have tobogganed? couldn't we have tobogganed? couldn't you have tobogganed? couldn't they have tobogganed?	couldn't I have been tobogganing? couldn't you have been tobogganing? couldn't he have been tobogganing? couldn't we have been tobogganing? couldn't you have been tobogganing? couldn't they have been tobogganing?