Relative Clauses

When to Use That in Relative Clause

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WHEN TO USE THAT IN RELATIVE CLAUSE
1. That is used to replace who, whom, which in defining relative clauses:
Example:
  • The doctor whom/ that/ I was hoping to see wasn't on duty.
2. after superlatives:
Example:
He was the most interesting person that I have ever met.
3. after only, the first, the second, the last,...
Example:
It was the first time that I heard of it.
4. after noun phrase compose of person and object:
Example:
She talked about the people and places that she had visited.
5. after indefinite pronouns, quantity pronouns: someone, somthing, anyone, anything, noone, nothing, all, some, any, little,...
Example:
These books are all that my sister left me.
NOTES:
1.We cannot use That in non-defining relative clauses.
2. We cannot use use That after preposition.