The rule is given below. From book
" Building skills for Proficiency (Cesur ÖZTÜRK) "
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'To'+ Infinitive For Active or passive Constructions.
Relative clauses containin the following structures are replaced by infinitive phrases:
1. Ordinal numbers: the first, the next ...
Mike was the last person who arrived
Mike was the last person to arrive
2. " the only "
Mike was the only civilian who was allowed access to the military camp.
Mike was the only civilian (to be) allowed access to the military camp.
3. the superlative form
This is the largest ship which was built here last year.
This is the largest ship (to be) built here last year.
4.relative clauses containing modal auxiliaries.
He is not a man who can be trusted.
He is not a man to be trusted.
The procedure which will/should/must be followed is simple.
The procedure to be followed is simple.
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