The restrictive clause provides the meaning of a noun phrase and a noun. It provides information about a noun which is necessary and is not separated by commas in the sentence. It is also referred to as an essential phrase or clause.
Hence, the sentences which are restrictive are,
'Who owns a red car.'
'That ate my homework.'
'that have cherries.'
'that she gave them.'
In the above-restricted clauses, it restricts the meaning of the subject.
