could tile
Regular verb: tile - tiled- tiled

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