The phrase "admit all that" is correct and usable in written English.
It can be used when acknowledging or confessing to a particular situation or set of circumstances.
Example: "I have to admit all that I have done in the past has led me to this moment."
Alternatives: "acknowledge everything" or "confess all of it".
Mr. Boehner can't admit all that because private-sector slack and a dearth of jobs call for more federal aid, not less.
I've sort of admitted all those things, and I'm now at the point where I've started thinking: 'Oh, did I mean to admit all that?' But I've done it now". She hadn't intended to when she first started writing.
But I must admit, all that falls by the wayside when I first see the town house's main attribute: a 1,395-square-foot 1,395-square-foot 1,395-square-footped backyard.
He wrote to Theo, "I admit all that, but all the same it is true that to attain the high yellow note…I really had to be pretty well keyed up".
(This may be why people take so long with the homework! It can be kind of intense to have to admit all that).
You thought the league was going to be easier, but actually it gets harder every year because they know who you are". Chistov admits all that has made life more difficult his second season.
"Since the day when the greatness of Johann Sebastian Bach was admitted, all that was great in his lifetime has become less than nothing," he wrote in his 1922 essay, which seems to have been overlooked as fully as Telemann.
Asked whether non-Christians were admitted, she explained that "we admit all students without discrimination.
He admits all of that Facebook stuff was a huge mistake.
Socrates, as portrayed in the early dialogues of his pupil Plato, was always questioning the knowledge claims of others; in the Apology, he famously admits that all that he really knows is that he knows nothing.
