Hello teachers. I've been taught that when a word ends with /tʃ/, like in watch (/wɒtʃ/), if we add the suffix -ed to the word, it is pronounced /t/.
So, why does the suffix -ed in wretched is pronounced /ɪd/: /ˈretʃɪd/?
Additionally, there is a verb "to retch". The simple past is "retched" - one syllable. If you add a "w" at the beginning, you get the adjective "wretched" which has two syllables.