No doubt or without doubt ?

We can use no doubt when we think that what we are saying is likely to happen, or when we think it is true. It is similar to ‘I suppose’ or ‘I imagine’:

No doubt you’ll want breakfast before you leave tomorrow.

Yes, if that’s okay.

No problem.

We can use there is no doubt that … when we are very certain about our opinion. We use it in formal situations:

He’s never won Wimbledon, but there’s no doubt that he is a great tennis player.

Not: He’s never won a Wimbledon title but no doubt he’s a great tennis player.

Without doubt is even more formal. We use it when we are absolutely certain about our opinion:

Paul McCartney is without doubt one of the greatest composers of popular music of all time.

Not: Paul McCartney is no doubt one of the greatest …