Используйте «be a witness of» в предложении

1. And that thou mayest see that being so relentless to myself I cannot possibly be otherwise to thee, I have summoned thee to be a witness of the sacrifice I mean to offer to the injured honour of my honoured husband, wronged by thee with all the assiduity thou wert capable of, and by me too through want of caution in avoiding every occasion, if I have given any, of encouraging and sanctioning thy base designs

2. Of course we fell to questioning him, but to our wonder, although he "happened" to be a witness of the scene himself, he could give us no detailed account of it

3. I don't wish him to be a witness of our conversation