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 could not toboggan you could not toboggan he could not toboggan we could not toboggan you could not toboggan they could not toboggan	I could not be tobogganing you could not be tobogganing he could not be tobogganing we could not be tobogganing you could not be tobogganing they could not be tobogganing
Perfect	V-ing perfect
I could not have tobogganed you could not have tobogganed he could not have tobogganed we could not have tobogganed you could not have tobogganed they could not have tobogganed	I could not have been tobogganing you could not have been tobogganing he could not have been tobogganing we could not have been tobogganing you could not have been tobogganing they could not 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
could I not toboggan? could you not toboggan? could he not toboggan? could we not toboggan? could you not toboggan? could they not toboggan?	could I not be tobogganing? could you not be tobogganing? could he not be tobogganing? could we not be tobogganing? could you not be tobogganing? could they not be tobogganing?
Perfect	V-ing perfect
could I not have tobogganed? could you not have tobogganed? could he not have tobogganed? could we not have tobogganed? could you not have tobogganed? could they not have tobogganed?	could I not have been tobogganing? could you not have been tobogganing? could he not have been tobogganing? could we not have been tobogganing? could you not have been tobogganing? could they not have been tobogganing?