English verb conjugation
COULD SECOND-GUESS

Regular verb: second-guess - second-guessed - second-guessed

Affirmation

Simple form	V-ing form
I could second-guess you could second-guess he could second-guess we could second-guess you could second-guess they could second-guess	I could be second-guessing you could be second-guessing he could be second-guessing we could be second-guessing you could be second-guessing they could be second-guessing
Perfect	V-ing perfect
I could have second-guessed you could have second-guessed he could have second-guessed we could have second-guessed you could have second-guessed they could have second-guessed	I could have been second-guessing you could have been second-guessing he could have been second-guessing we could have been second-guessing you could have been second-guessing they could have been second-guessing

Negation

Simple form	V-ing form
I could not second-guess you could not second-guess he could not second-guess we could not second-guess you could not second-guess they could not second-guess	I could not be second-guessing you could not be second-guessing he could not be second-guessing we could not be second-guessing you could not be second-guessing they could not be second-guessing
Perfect	V-ing perfect
I could not have second-guessed you could not have second-guessed he could not have second-guessed we could not have second-guessed you could not have second-guessed they could not have second-guessed	I could not have been second-guessing you could not have been second-guessing he could not have been second-guessing we could not have been second-guessing you could not have been second-guessing they could not have been second-guessing

Interrogative form

Simple form	V-ing form
could I second-guess? could you second-guess? could he second-guess? could we second-guess? could you second-guess? could they second-guess?	could I be second-guessing? could you be second-guessing? could he be second-guessing? could we be second-guessing? could you be second-guessing? could they be second-guessing?
Perfect	V-ing perfect
could I have second-guessed? could you have second-guessed? could he have second-guessed? could we have second-guessed? could you have second-guessed? could they have second-guessed?	could I have been second-guessing? could you have been second-guessing? could he have been second-guessing? could we have been second-guessing? could you have been second-guessing? could they have been second-guessing?

Interro-negative form

Simple form	V-ing form
could I not second-guess? could you not second-guess? could he not second-guess? could we not second-guess? could you not second-guess? could they not second-guess?	could I not be second-guessing? could you not be second-guessing? could he not be second-guessing? could we not be second-guessing? could you not be second-guessing? could they not be second-guessing?
Perfect	V-ing perfect
could I not have second-guessed? could you not have second-guessed? could he not have second-guessed? could we not have second-guessed? could you not have second-guessed? could they not have second-guessed?	could I not have been second-guessing? could you not have been second-guessing? could he not have been second-guessing? could we not have been second-guessing? could you not have been second-guessing? could they not have been second-guessing?