それが起こりそうだ。の英語

It seems probable.

It's a probability.

That's going to happen?

it could happen any time now

That is probable―very likely―quite likely―likely enough―（は現在の事、未来の事なら）―That is likely to happen.

That is very likely to happen.

That looks fun.

It may occur at any moment.

What will happen is that.

That will work itself out somehow.

It may well happen.

I think we [I] can make something out of this.

I think something can be made out of this.

It may well happen.

It is quite within the bounds of possibility.

It may give rise to serious trouble.

It might be realized.

That is very likely―enough.

certain to occur

You will probably know when it happens.

You will probably understand it then.

It may occur at any moment.

I can probably do that.

That, I should [would] say, is true.

it should be said

something that is a sure to occur

I should say so.

〈あいづちを打って〉 Yes, I think so, too.

It may be possible to materialize that.

a dead cert