Let's evaluate each sentence:
-
My cat, that mostly stays outside, climbs on the window when she wants to come inside.
- This sentence is incorrect. The correct phrasing should use "which" instead of "that" in a non-restrictive clause. It should be "My cat, which mostly stays outside, climbs on the window when she wants to come inside."
-
The clothes, which are dirty, won't all fit in the washing machine.
- This sentence is correct. The clause "which are dirty" is non-restrictive and properly uses "which."
-
I need shoes which are more comfortable for the marathon.
- This sentence is technically correct but in American English, it is more common to use "that" for restrictive clauses. It should ideally be "I need shoes that are more comfortable for the marathon." However, in British English, "which" can be acceptable.
-
My family adopted a dog that is a Dalmatian and Retriever mix.
- This sentence is correct. The use of "that" is appropriate in a restrictive clause.
In summary, the correct sentences are:
- The clothes, which are dirty, won't all fit in the washing machine.
- My family adopted a dog that is a Dalmatian and Retriever mix.
The first and third sentences have issues.