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 couldn't straiten you couldn't straiten she couldn't straiten we couldn't straiten you couldn't straiten they couldn't straiten	I couldn't be straitening you couldn't be straitening she couldn't be straitening we couldn't be straitening you couldn't be straitening they couldn't be straitening
Perfect	V-ing perfect
I couldn't have straitened you couldn't have straitened she couldn't have straitened we couldn't have straitened you couldn't have straitened they couldn't have straitened	I couldn't have been straitening you couldn't have been straitening she couldn't have been straitening we couldn't have been straitening you couldn't have been straitening they couldn't 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
couldn't I straiten? couldn't you straiten? couldn't she straiten? couldn't we straiten? couldn't you straiten? couldn't they straiten?	couldn't I be straitening? couldn't you be straitening? couldn't she be straitening? couldn't we be straitening? couldn't you be straitening? couldn't they be straitening?
Perfect	V-ing perfect
couldn't I have straitened? couldn't you have straitened? couldn't she have straitened? couldn't we have straitened? couldn't you have straitened? couldn't they have straitened?	couldn't I have been straitening? couldn't you have been straitening? couldn't she have been straitening? couldn't we have been straitening? couldn't you have been straitening? couldn't they have been straitening?