They might say "if I do this, then I think that will happen".

他们可能会说：“如果我这样做了，那么我认为那将会发生。”

youdao

If yewill do as I say, ye have these and ten thousand other good things, with noservile labour; but if ye will not do as I say, ye have labours like that ofyesterday innumerable.

如果你们听我的话，你们今后将拥有这些和成千上万其它的好东西，并且不会被人奴役劳作。 但如果你们不听我的话，你们就都像昨天那样有无尽的苦力要做。

youdao

If you listen carefully to what he says and do all that I say, I will be an enemy to your enemies and will oppose those who oppose you.

你若实在听从他的话，照着我一切所说的去行，我就向你的仇敌作仇敌，向你的敌人作敌人。

youdao

"Michaelson,listen to me, you can stand there and say anything you like, just stay there one minute longer, do not move,I will be right back, one minute!" He rushed outside.

VOA: special.2011.03.05

Yes, if you are going to do that, I would say you are probably will be the first.

嗯，这样说的话，你可能真的是第一人。

普林斯顿公开课 - 人性课程节选

and say "I won't", which of course means that you will not do something.

用 “I won't” 来表示并不打算做某事。

I will 课堂 - SpeakingMax英语口语达人

And as I think my representatives have said repeatedly, and I will say today, I think there are folks who do good work in that area.

WHITEHOUSE: President Obama Holds a Press Conference

So if you will forgive me, I will do my best to say what it is I want to say to you.

CNN: Transcript: Clinton speaks to prayer breakfast

"I can't say anything precise about what I will do - I don't want to define my role inside Ferrari yet, " said the 37-year-old German.

BBC: SPORT | Motorsport | Formula One | Schumacher offered Ferrari role