Also make sure you use a /z/ sound on the end of the word. Say "sez" /sɛz/, not "s-ay-s" /ses/.
For more help with vowel /ɛ/, go to our practice for vowel /ɛ/.
For more help with final /z/ sounds, check out our practice for final /z/.
For more everyday mistakes, see our YouTube playlist and our Quick Fix Practice.