To understand it, you must follow these rules:
Rule #1
Verbs that end by D or T, you, when you add ED at the end of the verbs, the sound will be /id /
Ex: want--wantED /wantid/
need--needED /nidid/
Rule #2
Verbs that end by SS, CH, SH, P, C, K, X, GH, you, when you add ED at the end of the verbs, the sound will be /t /
Ex: Jump---jumpED /djompt/
laugh---laughED /laft/
wash---wasED /wast/
kiss---kissED /kist/
Rule #3
Verbs that end by R, L, S, W, V, M, N, Q, B, E you, when you add ED at the end of the verbs, the sound will be /d/
Ex: love---lovED / lóvd/
clean---cleanED / klind/
use---usED /usd/
call---callED / kóld/
