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#### hirashin

##### Sempai
Donor
Dear native English speakers,
which sentences do you use?

Do you say either of these sentences?
(1a) This is the first book my uncle wrote.
(1b) This is the first book that my uncle wrote.
(1c) This is the first book which my uncle wrote.
(2a) This is the first book my uncle has written.
(2b) This is the first book that my uncle has written.
(2c) This is the first book which my uncle has written.

To my knowledge, 1c and 2c are not used. Am I right?

Hirashin

#### Buntaro

##### 運動不足
To my knowledge, 1c and 2c are not used. Am I right?
You are correct.