How to say which in Arabic

The above are various ways to say which using the singular, dual and plural versions. These are called relative pronouns and they should be used with the noun which they relate to. So for example:
ٌالبابُ الذي فتحتُ مكسور – The door which I opened is broken.
The relative pronoun الذي relates to the word door, and they agree in gender. It would not agree, or be allowed, if you used the relative pronoun التي as this word relates to something feminine.
The above sentence is a nominal sentence.
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