For French speakers

then or zen?

/ð/ often replaced with /z/ by speakers whose L1 lacks interdentals.

then and zen, side by side
then/ð/zen/z/

The sound in “then”

/ð/

as in this /ðɪs/

Like /θ/ but voiced.

Tongue:
tip-dental
Lips:
neutral
Voicing:
voiced

The sound in “zen”

/z/

as in zoo /zu/

Like /s/ but voiced.

Tongue:
tip-alveolar
Lips:
spread
Voicing:
voiced

Hear the difference

Tap each word. Every pair differs by exactly one sound — if both sound the same when you say them, this is your pair to drill.

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