You can try spelling some ee words here and here. A very common way of spelling the long /e/ sound is with the letters ea. Here are some examples: peach.

What are the long E words?

IE, EI, and EY Vowel Teams

Examples include brief, relief, and rookie. The long e sound spelled ey is usually at the end of a base word. Examples include valley and monkey.

What makes a long e sound?

The vowel team rule states that when two vowels go walking, the first one does the talking. The combination of two e's (double vowels) results in the long e sound. There are many EE words. The combination of both an “e” and “a” (double vowels) also results in this sound.