English verb conjugation
COULD TIE

Regular verb: tie - tied - tied

Affirmation

Simple form	V-ing form
I could tie you could tie he could tie we could tie you could tie they could tie	I could be tying you could be tying he could be tying we could be tying you could be tying they could be tying
Perfect	V-ing perfect
I could have tied you could have tied he could have tied we could have tied you could have tied they could have tied	I could have been tying you could have been tying he could have been tying we could have been tying you could have been tying they could have been tying

Negation

Simple form	V-ing form
I couldn't tie you couldn't tie he couldn't tie we couldn't tie you couldn't tie they couldn't tie	I couldn't be tying you couldn't be tying he couldn't be tying we couldn't be tying you couldn't be tying they couldn't be tying
Perfect	V-ing perfect
I couldn't have tied you couldn't have tied he couldn't have tied we couldn't have tied you couldn't have tied they couldn't have tied	I couldn't have been tying you couldn't have been tying he couldn't have been tying we couldn't have been tying you couldn't have been tying they couldn't have been tying

Interrogative form

Simple form	V-ing form
could I tie? could you tie? could he tie? could we tie? could you tie? could they tie?	could I be tying? could you be tying? could he be tying? could we be tying? could you be tying? could they be tying?
Perfect	V-ing perfect
could I have tied? could you have tied? could he have tied? could we have tied? could you have tied? could they have tied?	could I have been tying? could you have been tying? could he have been tying? could we have been tying? could you have been tying? could they have been tying?

Interro-negative form

Simple form	V-ing form
couldn't I tie? couldn't you tie? couldn't he tie? couldn't we tie? couldn't you tie? couldn't they tie?	couldn't I be tying? couldn't you be tying? couldn't he be tying? couldn't we be tying? couldn't you be tying? couldn't they be tying?
Perfect	V-ing perfect
couldn't I have tied? couldn't you have tied? couldn't he have tied? couldn't we have tied? couldn't you have tied? couldn't they have tied?	couldn't I have been tying? couldn't you have been tying? couldn't he have been tying? couldn't we have been tying? couldn't you have been tying? couldn't they have been tying?