"this" and "that" change shape with de or het.
de-words
this = deze · that = die
deze auto · die autothis car · that car
het-words
this = dit · that = dat
dit huis · dat huisthis house · that house
near you = deze / dit. further away = die / dat.
easiest way to rememberde-word → deze / die. het-word → dit / dat.