- Give more information.
- Useful for writing long sentences. (Long Sentences is Need!! Too many short sentences are childish.)
Two kinds:
Definitive relative clauses
DR tell us ‘which thing’. We cannot easily take the DR clauses out of a sentences.
(e.g.) The model that was used by Mitchell et al. …
(e.g.) The inventor of this device was a person who had …
If the pronoun (that, who, where, etc.) is the object of the sentence, we can leave it out.
(e.g.) The model that was used by Mittchell et al. … → Mitchell et al. used the model [object] → The model that was used by Mitchell et al. …
Also, if ‘be’ follows the pronoun we can leave out both the pronoun and ‘be’.
(e.g.) We used the same model that produced the best results in the first experiment. → The model [subject] produced the best results … → We must use the pronoun.
DR do not use commas.
| thing | person | |
|---|---|---|
| subject | that, which (formal) | who, that |
| object | -(, that, which) | -(, whom) |
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