Reveal the word
Utter an [s] during a few seconds. Next, repeat it but stopping this sound with a [t], and then, go on with the sequence uttering an [s] again: ssssssss // sssssssstssssssss. You could also find the sound within the following combination: fet sorprenent ‘striking event’. Utter both words slowly and pay special attention to the highlighted combination.
Repeat these exercises two or three times.