As you read on the previous page, the Dutch have several pronouns with a stressed (or 'marked') and a regular, unstressed form. I will repeat them here:

English	Dutch - unstressed	Dutch - stressed
You	je	jij
She	ze	zij
It	het	demonstrative? dit, dat
We	we	wij
they [persons]	ze	zij
they [inanimate]	ze	demonstrative? deze, die

Ik (I), hij (he), and jullie (plural you) do not have separate words for stressed and unstressed pronouns.

If we want to stress inanimate het (it) and ze (they), we use a demonstrative pronoun?.

Examples

Je and jij:

Unstressed	Je hoeft je geen zorgen te maken.	You do not have to worry.
Stressed	Jij hoeft je geen zorgen te maken (maar ik wel).	You do not have to worry (but I do).

Ze and zij:

Unstressed	Ze wilde niet mee.	She did not want to come along.
Stressed	Zij wilde niet mee (maar de anderen wel).	She did not want to come along (but the others did).

Het and dit/dat:

Unstressed	Het staat nog steeds te koop.	It is still for sale.
Stressed	Dat staat nog steeds te koop (maar die andere huizen zijn al verkocht).	That is still for sale (but the other houses are already sold)

We and wij:

Unstressed	We waren op tijd.	We were on time.
Stressed	Wij waren op tijd (de anderen niet).	We were on time (the others were not).

Ze and zij (persons):

Unstressed	Dat zeggen ze altijd.	They always say that.
Stressed	Dat zeggen zij altijd (niet iemand anders).	They always say that (not someone else).

Ze and deze/die (inanimate):

Unstressed	Ze zijn tijdelijk afgeprijsd.	They are temporarily discounted.
Stressed	Deze zijn afgeprijsd (maar die niet).	They are discounted (but those are not)

For someone who is learning Dutch, it is often difficult to determine when a pronoun needs to be stressed. This skill can only be aquired by experience. It may be helpful to know that unstressed pronouns are more commonly used than stressed pronouns.