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PRONUNCIATION

You can use some mnemonics to remember the voiceless consonants- "kapazo / chufas" for example, after which you pronounce /t/ in past and past participles of regular verbs. Find a picture from ThoughtCo with all the consonants below:

examples
Pronunciation of -ed,past simple and past participle of regular verbs
   1) when the final sound of the verb is /t/ or /d/
  2) when the final sound of the verb is voiceless /p, f, s, ʃ, tʃ, k, /θ//
  3) when the final sound of the verb is voiced   
      / b, g, v, z, ʒ, dʒ, m, n, ŋ, l, ð and r/ and all vocalic sounds.

Pronunciation of -ed by MADA

Find a file called past.zip file to practise this pronunciation rules on Downloads/Listening/Pronunciation
Pronunciation of -ed sounds. Past simple regular verbs and past participles.
Pronunciation of -ed, an interactive worksheet by victor
liveworksheets.com

pronouncing /IZ/ pLURALS AND THIRD PERSON PRESENT SINGULAR ENDINGS IN -ES

According to English with Julia  we pronounce /iz/  when we have the endings /s/, /z/, /dʒ/, /tʃ/ and /ʃ/ that are quite similar to /s/ and /z/. So, we need a vowel to hear the ending.  Find her video and do the activities on the pronunciation of /z/, /s/ and iz/ for plurals and third person singular of the present simple. By the way, the verb play /plei/ has already "i" in its infinitive so you do not add /iz/ when forming the plural or the third person singular of the present simple in fact. Check the answer of number 4 on Julia's activities because it shoud be /z/ for plays.
Find some more activities below.