(xv) That as a relative pronoun, is preferred to who or which in the following cases:
(a) after the interrogation pronouns who and what. Examples are:
Who is there that will not love his country?
What is that brings you here?
(b) after adjectives in the superlative degree and after the words such as any,
all, same, none, nothing, the only
King Solomon is said to be the wisest king that ever lived.
The utmost that we can do is to give you time.
Any fool that walks will say so.
This is the same taxi that we hired yesterday.
None that knows him will go against him.
He had nothing else that he could offer the beggar woman.
It is the only woman that cooks our food.
Man is the only animal that cooks his food.
(c) That, as a relative pronoun is never used after a preposition. For example:
Nobody sets fire to a house that he lives in.
is used as a relative pronoun after such a, as many as
, or the same
Such a student as he could hardly be found.
As many students as came were admitted.
This is not the same book as mine (is).
Here the verb is
is omitted. But if the verb is expressed explicitly that
is used in place of as
. For example:
This is not the book that was purchased by me.
(xvi) When the subject is relative pronoun, the verb must agree with the antecedent
in number, and person. As for example:
It is I who am to blame.