To make the /st/ sound: This cluster is a combination of the /s/ and /t/ sounds. Begin with the /s/ sound — it should be a voiceless stream of air from your mouth. Be careful not to include an “e” sound before the /s/ begins. As you produce /s/, the tip of your tongue should be close to, but not completely touching, the top of your mouth. To make the /t/, press the tip of your tongue completely against the roof of your mouth, briefly stopping the air. Then, release your tongue again. Also be careful not to make a vowel sound like “e” between the /s/ and the /t/. The /t/ should immediately follow the /s/. Sometimes, an /r/ sound may follow /st/. After you produce the /t/, curl your the tip of your tongue up and back slightly to make the /r/ immediately after you release the /t/.