could tile
Regular verb: tile - tiled- tiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I could not tile
you could not tile
he could not tile
we could not tile
you could not tile
they could not tile 	I could not be tiling
you could not be tiling
he could not be tiling
we could not be tiling
you could not be tiling
they could not be tiling	I could not have tiled
you could not have tiled
he could not have tiled
we could not have tiled
you could not have tiled
they could not have tiled	I could not have been tiling
you could not have been tiling
he could not have been tiling
we could not have been tiling
you could not have been tiling
they could not have been tiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
could I not tile?
could you not tile?
could he not tile?
could we not tile?
could you not tile?
could they not tile? 	could I not be tiling?
could you not be tiling?
could he not be tiling?
could we not be tiling?
could you not be tiling?
could they not be tiling? 	could I not have tiled?
could you not have tiled?
could he not have tiled?
could we not have tiled?
could you not have tiled?
could they not have tiled? 	could I not have been tiling?
could you not have been tiling?
could he not have been tiling?
could we not have been tiling?
could you not have been tiling?
could they not have been tiling?