A ch发的是清音。
加ed 以后的发音有如下三种:
1) ed 在清辅音[p][t][k][f][s][h]等后读[ t ]
如:helped, washed, watched, marked, finished, stopped, skipped, cooked, worked
2)ed 在浊辅音[d][g][v][z][r][m][n]等后及元音后读[d],如:
cleaned, played, prepared
3)ed在[t][d]后读[id] ,如:
painted, started, visited
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