The phrase "capable of doing all three" is correct and usable in written English.
It is often used to suggest that someone or something has the ability to do three different things. For example, "He is capable of doing all three tasks within the deadline."
We're all capable of doing all sorts of things".
Light, after all, consists of photons, which are capable of doing all kinds of strange things.
It's regrettable because there are wonderful dancers capable of doing all kinds of things.
Veteran playwright Israel Horovitz believes no actor is capable of doing it all.
And then I was so blown away by what I was capable of doing with one arm — because for a lot of that, there was no way I could utilize my real arm — so that says a lot.
Everyone I know that suffers from macular degeneration has a sense of loss, because so many things that one was once capable of doing, one is no more.
The customer looked annoyed and declared with a huff: "I am capable of doing two things at once".
Alan was forever arguing some involved point; Bernard, always capable of doing two things at once, would be contesting the point while correcting proofs.
George Osborne is a clever politician and if he's proved that he's capable of doing one thing really well, it's nicking the Labour Party's plans.
"It's integration with those who are capable of doing it".The four founding members are free-market and mainly fast-growing economies which have embraced globalisation, with a web of regional trade-agreements and expanding commercial ties to Asia.
If they are not capable of doing that, the two could announce they will complete the primary schedule and convention with the winner becoming candidate for president and the other agreeing to be a candidate for vice president, thereby mollifying to some extent the constituency of the candidate who was not chosen as the nominee for president.
