English verb conjugation
COULD TILE

Regular verb: tile - tiled - tiled

Affirmation

Simple form	V-ing form
I could tile you could tile he could tile we could tile you could tile they could tile	I could be tiling you could be tiling he could be tiling we could be tiling you could be tiling they could be tiling
Perfect	V-ing perfect
I could have tiled you could have tiled he could have tiled we could have tiled you could have tiled they could have tiled	I could have been tiling you could have been tiling he could have been tiling we could have been tiling you could have been tiling they could have been tiling

Negation

Simple form	V-ing form
I couldn't tile you couldn't tile he couldn't tile we couldn't tile you couldn't tile they couldn't tile	I couldn't be tiling you couldn't be tiling he couldn't be tiling we couldn't be tiling you couldn't be tiling they couldn't be tiling
Perfect	V-ing perfect
I couldn't have tiled you couldn't have tiled he couldn't have tiled we couldn't have tiled you couldn't have tiled they couldn't have tiled	I couldn't have been tiling you couldn't have been tiling he couldn't have been tiling we couldn't have been tiling you couldn't have been tiling they couldn't have been tiling

Interrogative form

Simple form	V-ing form
could I tile? could you tile? could he tile? could we tile? could you tile? could they tile?	could I be tiling? could you be tiling? could he be tiling? could we be tiling? could you be tiling? could they be tiling?
Perfect	V-ing perfect
could I have tiled? could you have tiled? could he have tiled? could we have tiled? could you have tiled? could they have tiled?	could I have been tiling? could you have been tiling? could he have been tiling? could we have been tiling? could you have been tiling? could they have been tiling?

Interro-negative form

Simple form	V-ing form
couldn't I tile? couldn't you tile? couldn't he tile? couldn't we tile? couldn't you tile? couldn't they tile?	couldn't I be tiling? couldn't you be tiling? couldn't he be tiling? couldn't we be tiling? couldn't you be tiling? couldn't they be tiling?
Perfect	V-ing perfect
couldn't I have tiled? couldn't you have tiled? couldn't he have tiled? couldn't we have tiled? couldn't you have tiled? couldn't they have tiled?	couldn't I have been tiling? couldn't you have been tiling? couldn't he have been tiling? couldn't we have been tiling? couldn't you have been tiling? couldn't they have been tiling?