Present
I gainsay
you gainsay
he gainsays
we gainsay
you gainsay
they gainsay

Perfect
I have gainsayed/gainsaid
you have gainsayed/gainsaid
he has gainsayed/gainsaid
we have gainsayed/gainsaid
you have gainsayed/gainsaid
they have gainsayed/gainsaid

Past
I gainsayed/gainsaid
you gainsayed/gainsaid
he gainsayed/gainsaid
we gainsayed/gainsaid
you gainsayed/gainsaid
they gainsayed/gainsaid

Pluperfect
I had gainsayed/gainsaid
you had gainsayed/gainsaid
he had gainsayed/gainsaid
we had gainsayed/gainsaid
you had gainsayed/gainsaid
they had gainsayed/gainsaid

Future
I will gainsay
you will gainsay
he will gainsay
we will gainsay
you will gainsay
they will gainsay

Future perfect
I will have gainsayed/gainsaid
you will have gainsayed/gainsaid
he will have gainsayed/gainsaid
we will have gainsayed/gainsaid
you will have gainsayed/gainsaid
they will have gainsayed/gainsaid

Present
I gainsay
you gainsay
he gainsay
we gainsay
you gainsay
they gainsay

Present
I have gainsayed/gainsaid
you have gainsayed/gainsaid
he have gainsayed/gainsaid
we have gainsayed/gainsaid
you have gainsayed/gainsaid
they have gainsayed/gainsaid

Imperfect
I gainsayed/gainsaid
you gainsayed/gainsaid
he gainsayed/gainsaid
we gainsayed/gainsaid
you gainsayed/gainsaid
they gainsayed/gainsaid

Pluperfect
I had gainsayed/gainsaid
you had gainsayed/gainsaid
he had gainsayed/gainsaid
we had gainsayed/gainsaid
you had gainsayed/gainsaid
they had gainsayed/gainsaid

Present
I would gainsay
you would gainsay
he would gainsay
we would gainsay
you would gainsay
they would gainsay

Perfect
I would have gainsayed/gainsaid
you would have gainsayed/gainsaid
he would have gainsayed/gainsaid
we would have gainsayed/gainsaid
you would have gainsayed/gainsaid
they would have gainsayed/gainsaid

you gainsay
we Let's gainsay
you gainsay

Present
I am gainsaying
you are gainsaying
he is gainsaying
we are gainsaying
you are gainsaying
they are gainsaying

Perfect
I have been gainsaying
you have been gainsaying
he has been gainsaying
we have been gainsaying
you have been gainsaying
they have been gainsaying

Past
I was gainsaying
you were gainsaying
he was gainsaying
we were gainsaying
you were gainsaying
they were gainsaying

Pluperfect
I had been gainsaying
you had been gainsaying
he had been gainsaying
we had been gainsaying
you had been gainsaying
they had been gainsaying

Future
I will be gainsaying
you will be gainsaying
he will be gainsaying
we will be gainsaying
you will be gainsaying
they will be gainsaying

Future perfect
I will have been gainsaying
you will have been gainsaying
he will have been gainsaying
we will have been gainsaying
you will have been gainsaying
they will have been gainsaying

Present
I would be gainsaying
you would be gainsaying
he would be gainsaying
we would be gainsaying
you would be gainsaying
they would be gainsaying

Perfect
I would have been gainsaying
you would have been gainsaying
he would have been gainsaying
we would have been gainsaying
you would have been gainsaying
they would have been gainsaying