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Gaff can speak English, but he chooses not to.

Indeed, as the OP mentioned, it is quite impossible that Gaff would learn English in a matter of a few days. Moreover, in the original book, Gaff has a slightly bigger role and he converses quite a bit with Deckard about his job.

So why doesn't he use English?

Well, most likely because he initially dislikes Deckard and to show that he is better than him: The 'Cityspeak' is used by the criminal underworld, so by using it Gaff shows that he is a "professional cop", who is knowledgable about the dangerous parts of the city. But instead of being assigned to chase the missing replicants, his boss — Bryant — sends him as an errand boy to pick up some washed-up ex-Blade Runner.

Gaff can speak English, but he chooses not to.

Indeed, as the OP mentioned, it is quite impossible that Gaff would learn English in a matter of a few days. Moreover, in the original book, Gaff has a slightly bigger role, and he converses quite a bit with Deckard about his job.

So why doesn't he use English?

Well, most likely because he initially dislikes Deckard and to show that he is better than him: The 'Cityspeak' is used by the criminal underworld, so by using it Gaff shows that he is a "professional cop", who is knowledgeable about the dangerous parts of the city. But instead of being assigned to chase the missing replicants, his boss — Bryant — sends him as an errand boy to pick up some washed-up ex-Blade Runner.

Also, as @PoloHoleSet mentioned in comments, Deckard most likely understands perfectly Gaff, but decided to be a pain in the butt and play dumb.

Bryant can speak English, but he chooses not to.

Indeed, as the OP mentioned, it is quite impossible that Gaff would learn English in a matter of a few days. Moreover, in the original book, Gaff has a slightly bigger role and he converses quite a bit with Deckard about his job.

So why doesn't he use English?

Well, most likely because he initially dislikes Deckard and to show that he is better than him: The Cityspeak is used by the criminal underworld, so by using it Gaff shows that he is a "professional cop", who is well knowledgable about the dangerous parts of the city. But instead of being assigned to chase the missing replicants, his boss — Bryant — sends him as an errand boy to pick up some washed-up ex-cop.

Gaff can speak English, but he chooses not to.

Indeed, as the OP mentioned, it is quite impossible that Gaff would learn English in a matter of a few days. Moreover, in the original book, Gaff has a slightly bigger role and he converses quite a bit with Deckard about his job.

So why doesn't he use English?

Well, most likely because he initially dislikes Deckard and to show that he is better than him: The 'Cityspeak' is used by the criminal underworld, so by using it Gaff shows that he is a "professional cop", who is knowledgable about the dangerous parts of the city. But instead of being assigned to chase the missing replicants, his boss — Bryant — sends him as an errand boy to pick up some washed-up ex-Blade Runner.

Bryant can speak English, but he chooses not to.

Indeed, as the OP mentioned, it is quite impossible that Gaff would learn English in a matter of a few days. Moreover, in the original book, Gaff has a slightly bigger role and he converses quite a bit with Deckart about his job.

So why doesn't he use English?

Well, most likely because he initially dislikes Deckart and to show that he is better than him: The Cityspeak is used by the criminal underworld, so by using it Gaff shows that he is a "professional cop", who is well knowledgable about the dangerous parts of the city. But instead of being assigned to chase the missing replicants, his boss - Bryant - sends him as an errand boy to pick up some washed-up ex-cop.

Bryant can speak English, but he chooses not to.

Indeed, as the OP mentioned, it is quite impossible that Gaff would learn English in a matter of a few days. Moreover, in the original book, Gaff has a slightly bigger role and he converses quite a bit with Deckard about his job.

So why doesn't he use English?

Well, most likely because he initially dislikes Deckard and to show that he is better than him: The Cityspeak is used by the criminal underworld, so by using it Gaff shows that he is a "professional cop", who is well knowledgable about the dangerous parts of the city. But instead of being assigned to chase the missing replicants, his boss — Bryant — sends him as an errand boy to pick up some washed-up ex-cop.