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Je déplace le coussin sur lequel tu dors.

Je déplace le coussin sur lequel tu dors.
I am moving the cushion on which you sleep.
From Lesson 168:Relative pronouns with prepositions (lequel)·French

Questions & Answers about Je déplace le coussin sur lequel tu dors.

Why do we use sur lequel here instead of que or qui?
In French, when you need to say 'on which', 'with which', or 'for which', you must use a preposition followed by a form of lequel. Relative pronouns like que (that/which) and qui (who/which) cannot be used directly after simple prepositions like sur when referring to things.
Why is it lequel and not laquelle or lesquels?
Lequel changes its form to match the gender and number of the noun it replaces. Here, 'which' refers to le coussin (the cushion). Since coussin is masculine and singular, you use the masculine singular form: lequel. If you were moving a feminine object like a chair (la chaise), it would be sur laquelle.
Could I use bouger instead of déplacer to say 'I am moving the cushion'?
Not quite! Déplacer specifically means moving an object from one place to another to change its location. Bouger simply means to make a physical movement or to budge. Since you are picking up the cushion and relocating it, déplacer is the natural choice.
As a refresher, why does dors end in an 's'?
Dormir (to sleep) is an irregular verb. Even though it ends in '-ir', it doesn't follow the regular pattern. For the je and tu forms, you drop the last three letters ('-mir') from the infinitive and add '-rs', giving you je dors and tu dors.

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