この計画が成功するかどうかまだ分からない。の英語

It is yet to be seen whether this plan will succeed or not.

The plan is bound to succeed.

Such a plan can hardly succeed.

This plan doesn't have any chance at all [whatsoever] of success.

The plan isn't a starter, I'm afraid.

His plan has never succeeded even once so far.

Such a plan is bound to fail.

I'm afraid the project wouldn't pay off.

His plan is s non-starter.

We heard with regret that you were not successful in your plan.

That plan will probably fail in the long run.

There is an impossibility in this plan.

The project is, in all probability, a failure.

Those plans won't really go as hoped.

This plan is impossible to accomplish.

That plan resulted with failure.

I don't see why this plan isn't working well.

That is not a good plan.

an unlikely plan

The plan did not work well in practice.

The plan was destined to miscarry.

Little did I imagine that my plan would go wrong.

The project was a complete failure.

As yet, the project is in the air.

Practically, the plan didn't work well.

The plan failed after all.

The plan was destined for failure.

plans are still uncertain

The plan has failed.

I can not possibly approve of your plan.