English verb conjugation
COULD PROPEL

Regular verb: propel - propelled - propelled

Affirmation

Simple form	V-ing form
I could propel you could propel he could propel we could propel you could propel they could propel	I could be propelling you could be propelling he could be propelling we could be propelling you could be propelling they could be propelling
Perfect	V-ing perfect
I could have propelled you could have propelled he could have propelled we could have propelled you could have propelled they could have propelled	I could have been propelling you could have been propelling he could have been propelling we could have been propelling you could have been propelling they could have been propelling

Negation

Simple form	V-ing form
I couldn't propel you couldn't propel he couldn't propel we couldn't propel you couldn't propel they couldn't propel	I couldn't be propelling you couldn't be propelling he couldn't be propelling we couldn't be propelling you couldn't be propelling they couldn't be propelling
Perfect	V-ing perfect
I couldn't have propelled you couldn't have propelled he couldn't have propelled we couldn't have propelled you couldn't have propelled they couldn't have propelled	I couldn't have been propelling you couldn't have been propelling he couldn't have been propelling we couldn't have been propelling you couldn't have been propelling they couldn't have been propelling

Interrogative form

Simple form	V-ing form
could I propel? could you propel? could he propel? could we propel? could you propel? could they propel?	could I be propelling? could you be propelling? could he be propelling? could we be propelling? could you be propelling? could they be propelling?
Perfect	V-ing perfect
could I have propelled? could you have propelled? could he have propelled? could we have propelled? could you have propelled? could they have propelled?	could I have been propelling? could you have been propelling? could he have been propelling? could we have been propelling? could you have been propelling? could they have been propelling?

Interro-negative form

Simple form	V-ing form
couldn't I propel? couldn't you propel? couldn't he propel? couldn't we propel? couldn't you propel? couldn't they propel?	couldn't I be propelling? couldn't you be propelling? couldn't he be propelling? couldn't we be propelling? couldn't you be propelling? couldn't they be propelling?
Perfect	V-ing perfect
couldn't I have propelled? couldn't you have propelled? couldn't he have propelled? couldn't we have propelled? couldn't you have propelled? couldn't they have propelled?	couldn't I have been propelling? couldn't you have been propelling? couldn't he have been propelling? couldn't we have been propelling? couldn't you have been propelling? couldn't they have been propelling?