ea is quite common in words. In order to understand the pronunciation rules of ea more easily, let's quickly understand a little knowledge before learning.
What are open syllables, closed syllables ?
(ea is a combination of vowels, considered as a whole)

ea. Generally, there are open syllables and closed syllables.
. The letter combination ea pronounces the long sound / i in the open syllable: /
is the vowel letter e itself, the most common
(1) absolute open syllable

(2) relatively open syllable

. The letter combination ea has a short sound /e in a closed syllable. /
(1) ea closed syllable / e /

Sometimes ea can also be pronounced in a closed syllable structure / i: /
(2) ea closed syllable / i: /

3, ea In special cases, pronounce the diphthong /eɪ /

(only three common words)
4, ea In special cases, read the diphthong / ɪə /

(fewer common words)
[Special case]
— ea is not pronounced in the word
beautiful / ˈbjuːtɪfl / beautiful
— ea发 / iːə /
realize / ˈriːəlaɪz / realize
ideal / aɪˈdiːəl / ideal
— ea发 / iˈæ /
reality / riˈæləti / Real
(Do you think it has become complicated instantly? In fact, you don’t have to remember it deliberately, just understand it. There are only a few words commonly used in special cases.)
[Small summary]
ea has two most commonly used pronunciations, long vowel / i: / and short vowel / e / , and the others can be considered special cases.
[Memory tips] In
ea, a is not pronounced, and e is pronounced as its own sound / i: In /
ea, a is not pronounced, and e is pronounced as a short sound / e /
ea. In /
ea, e is not pronounced, and a is pronounced as its own sound / eɪ /
[Soul question]
There are two pronunciations of ea in the closed syllable / i: / and / e /. So when to pronounce / i: / and when to pronounce / e /?
answer: Just my personal opinion. If you encounter an unknown word that contains ea, you can pronounce /i: / first, because the most common pronunciation of ea is /i: /, which accounts for most words. You can give priority to this pronunciation, which has a higher chance of being read correctly, or look it up in the dictionary later.
(If you have a better answer, please tell me!)
Have you learned the natural spelling?
(The level is limited, if there are any errors, please leave a message to point out and encourage each other.)