Englishfor English speakers
certificate
Noun
—
A certificate is a paper that acknowledges something like an award.
I finally got my certificate of honor from school.
of
Preposition
—
Made using.
It is a house of cards.
proof
Noun
—
Proof is evidence which shows something is correct.
He has proof that he was not at the crime scene. A witness says that they were somewhere else.
—
A proof can show how a theorem is correct.