1.The bed was comfortable in which I slept last night.
2.The bed was comfortable where I slept last night.
3.The bed was comfortable that I bought two years ago at the store.
4.The bed was comfortable , which I bought two years ago at the store. (a comma is added)
A Korean said to me the bold part must be preceded by "the bed" because the bed is their antecedent, but I'd object to his opinion and to me, whether they're positioned right after the bed or not, they seem to be all perfectly grammatical.
Are they all grammatically correct to native speaker's eyes ?
Your friend is right. The bed that I bought two years ago at the store was comfortable.
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Your friend is right.
The bed that I bought two years ago at the store was comfortable.