1. I do not like stories, that have sad endings.
2. I do not like stories, which have sad endings.
In the sentences, should there be a comma after 'stories'?
anonymous In the sentences, should there be a comma after 'stories'? e. to define which stories you mean, so no comma.
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anonymousIn the sentences, should there be a comma after 'stories'?
No, you want "that/which ~" to be defining, i.e. to define which stories you mean, so no comma.
(1) is not correctly formed since we do not (normally) use "that" with non-defining relative clauses. (2) suggests the strange meaning that all stories have sad endings.