Letter t - in every words the letter t you read it [t]. There's no portuguese words with the [tʃ].

Letter d - in every words the letter d you read it [d] (__d__ado). There's no portuguese words with the [dʒ].

Letter s - when you find the letter s between 2 vogals you read it [z] (t__eso__ura)
when you find the letter s between 2 consonants you read it [ʃ] (su__bst__antivo)
when you find the letter s between 1 vogals and 1 consonat you read it [ʃ] (b__ast__ou)
when you find the letter s between 1 consonat and 1 vogal you read it [s] (pe__nsa__)
when you find the letter s in the begining of the word you read it [s] (__s__al)
when you find the letter s in the end of the word you read it [ʃ] (casa__s__)
when you find 'ss' you read it [s] (pa__ss__a)

Letter z - you always read letter it [z] (__z__ebra)