Usages of qui
Sol, qui mane lucet, discipulum laetum facit.
The sun, which shines in the morning, makes the student happy.
Luna, quae nocte lucet, puellam quietam facit.
The moon, which shines at night, makes the girl calm.
Puer intrat cubiculum quod parvum est.
The boy enters the bedroom which is small.
Discipuli diu in bibliotheca manent, quia discere volunt etiam ea quae difficilia sunt, non solum quae facilia sunt.
The students stay in the library for a long time, because they want to learn even the things that are difficult, not only the things that are easy.
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