Breakdown of Où est-ce que tu jettes le plastique ?
tu
you (informal singular)
est-ce que
is it that / do / does (question marker)
où
where
jeter
to throw away
Questions & Answers about Où est-ce que tu jettes le plastique ?
Why is jettes spelled with two T's here?
Why do we use est-ce que here instead of just saying Où tu jettes?
You can form questions a few ways in French. Où est-ce que tu jettes... is the standard, most common way to ask this in everyday spoken French. You could also use inversion (Où jettes-tu...), which is more formal, or simple intonation (Tu jettes le plastique où ?), which is very casual. Adding est-ce que after a question word like où is a perfectly standard and balanced way to ask a question.
Do I pronounce the s at the end of jettes?
No, the -s at the end of tu jettes is completely silent. You just pronounce the word like the English word jet. In the present tense, the tu form of -er verbs (and stem-changers like this one) almost always ends in a silent s.
Why does plastique have le in front of it?