Use this or that with kind or sort because both are singular; use these or those with kinds or sorts because both are plural.
Examples: this or that kind of stocks, these or those kinds of stocks, this or that sort of people, these or those sorts of people
Choose the correct word (this, that, these, those) for each of the blanks in these sentences.
1. _____ sort of computer is much better.
2. Paul bought ____ kind of car.
3. I like ____ sorts of cars better.
4. ____ kinds of problems are hard.
5. What did ____ sorts of shoes cost?
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Answers

1. this or that
2. this or that
3. these or those
4. these or those
5. these or those