English verb conjugation
COULD TESSELLATE

Regular verb: tessellate - tessellated - tessellated

Affirmation

Simple form	V-ing form
I could tessellate you could tessellate he could tessellate we could tessellate you could tessellate they could tessellate	I could be tessellating you could be tessellating he could be tessellating we could be tessellating you could be tessellating they could be tessellating
Perfect	V-ing perfect
I could have tessellated you could have tessellated he could have tessellated we could have tessellated you could have tessellated they could have tessellated	I could have been tessellating you could have been tessellating he could have been tessellating we could have been tessellating you could have been tessellating they could have been tessellating

Negation

Simple form	V-ing form
I couldn't tessellate you couldn't tessellate he couldn't tessellate we couldn't tessellate you couldn't tessellate they couldn't tessellate	I couldn't be tessellating you couldn't be tessellating he couldn't be tessellating we couldn't be tessellating you couldn't be tessellating they couldn't be tessellating
Perfect	V-ing perfect
I couldn't have tessellated you couldn't have tessellated he couldn't have tessellated we couldn't have tessellated you couldn't have tessellated they couldn't have tessellated	I couldn't have been tessellating you couldn't have been tessellating he couldn't have been tessellating we couldn't have been tessellating you couldn't have been tessellating they couldn't have been tessellating

Interrogative form

Simple form	V-ing form
could I tessellate? could you tessellate? could he tessellate? could we tessellate? could you tessellate? could they tessellate?	could I be tessellating? could you be tessellating? could he be tessellating? could we be tessellating? could you be tessellating? could they be tessellating?
Perfect	V-ing perfect
could I have tessellated? could you have tessellated? could he have tessellated? could we have tessellated? could you have tessellated? could they have tessellated?	could I have been tessellating? could you have been tessellating? could he have been tessellating? could we have been tessellating? could you have been tessellating? could they have been tessellating?

Interro-negative form

Simple form	V-ing form
couldn't I tessellate? couldn't you tessellate? couldn't he tessellate? couldn't we tessellate? couldn't you tessellate? couldn't they tessellate?	couldn't I be tessellating? couldn't you be tessellating? couldn't he be tessellating? couldn't we be tessellating? couldn't you be tessellating? couldn't they be tessellating?
Perfect	V-ing perfect
couldn't I have tessellated? couldn't you have tessellated? couldn't he have tessellated? couldn't we have tessellated? couldn't you have tessellated? couldn't they have tessellated?	couldn't I have been tessellating? couldn't you have been tessellating? couldn't he have been tessellating? couldn't we have been tessellating? couldn't you have been tessellating? couldn't they have been tessellating?