English verb conjugation
COULD STRAITEN

Regular verb: straiten - straitened - straitened

Affirmation

Simple form	V-ing form
I could straiten you could straiten she could straiten we could straiten you could straiten they could straiten	I could be straitening you could be straitening she could be straitening we could be straitening you could be straitening they could be straitening
Perfect	V-ing perfect
I could have straitened you could have straitened she could have straitened we could have straitened you could have straitened they could have straitened	I could have been straitening you could have been straitening she could have been straitening we could have been straitening you could have been straitening they could have been straitening

Negation

Simple form	V-ing form
I could not straiten you could not straiten she could not straiten we could not straiten you could not straiten they could not straiten	I could not be straitening you could not be straitening she could not be straitening we could not be straitening you could not be straitening they could not be straitening
Perfect	V-ing perfect
I could not have straitened you could not have straitened she could not have straitened we could not have straitened you could not have straitened they could not have straitened	I could not have been straitening you could not have been straitening she could not have been straitening we could not have been straitening you could not have been straitening they could not have been straitening

Interrogative form

Simple form	V-ing form
could I straiten? could you straiten? could she straiten? could we straiten? could you straiten? could they straiten?	could I be straitening? could you be straitening? could she be straitening? could we be straitening? could you be straitening? could they be straitening?
Perfect	V-ing perfect
could I have straitened? could you have straitened? could she have straitened? could we have straitened? could you have straitened? could they have straitened?	could I have been straitening? could you have been straitening? could she have been straitening? could we have been straitening? could you have been straitening? could they have been straitening?

Interro-negative form

Simple form	V-ing form
could I not straiten? could you not straiten? could she not straiten? could we not straiten? could you not straiten? could they not straiten?	could I not be straitening? could you not be straitening? could she not be straitening? could we not be straitening? could you not be straitening? could they not be straitening?
Perfect	V-ing perfect
could I not have straitened? could you not have straitened? could she not have straitened? could we not have straitened? could you not have straitened? could they not have straitened?	could I not have been straitening? could you not have been straitening? could she not have been straitening? could we not have been straitening? could you not have been straitening? could they not have been straitening?