English verb conjugation
COULD TILL

Regular verb: till - tilled - tilled

Affirmation

Simple form	V-ing form
I could till you could till he could till we could till you could till they could till	I could be tilling you could be tilling he could be tilling we could be tilling you could be tilling they could be tilling
Perfect	V-ing perfect
I could have tilled you could have tilled he could have tilled we could have tilled you could have tilled they could have tilled	I could have been tilling you could have been tilling he could have been tilling we could have been tilling you could have been tilling they could have been tilling

Negation

Simple form	V-ing form
I could not till you could not till he could not till we could not till you could not till they could not till	I could not be tilling you could not be tilling he could not be tilling we could not be tilling you could not be tilling they could not be tilling
Perfect	V-ing perfect
I could not have tilled you could not have tilled he could not have tilled we could not have tilled you could not have tilled they could not have tilled	I could not have been tilling you could not have been tilling he could not have been tilling we could not have been tilling you could not have been tilling they could not have been tilling

Interrogative form

Simple form	V-ing form
could I till? could you till? could he till? could we till? could you till? could they till?	could I be tilling? could you be tilling? could he be tilling? could we be tilling? could you be tilling? could they be tilling?
Perfect	V-ing perfect
could I have tilled? could you have tilled? could he have tilled? could we have tilled? could you have tilled? could they have tilled?	could I have been tilling? could you have been tilling? could he have been tilling? could we have been tilling? could you have been tilling? could they have been tilling?

Interro-negative form

Simple form	V-ing form
could I not till? could you not till? could he not till? could we not till? could you not till? could they not till?	could I not be tilling? could you not be tilling? could he not be tilling? could we not be tilling? could you not be tilling? could they not be tilling?
Perfect	V-ing perfect
could I not have tilled? could you not have tilled? could he not have tilled? could we not have tilled? could you not have tilled? could they not have tilled?	could I not have been tilling? could you not have been tilling? could he not have been tilling? could we not have been tilling? could you not have been tilling? could they not have been tilling?