Answer :
The following are the restrictive clauses in these sentences, as they have an identifying function. Without these clauses the sentences still read as gramatically correct, but do not necessarily communicate all the important information.
1. 'who owns a red car'.
2. 'that ate my homework'.
3. 'that have cherries'.
4. 'that she gave them'.
1. 'who owns a red car'.
2. 'that ate my homework'.
3. 'that have cherries'.
4. 'that she gave them'.