Final answer:
The circumstances that account for Tan's development of more than one English is due to expressive aphasia, a language disorder that impairs communication. Personal history and culture can also impact language use. Differences in language can influence how we think and perceive the world.
Step-by-step explanation:
The circumstances that account for Tan's development of more than one English is due to a condition known as expressive aphasia. Expressive aphasia is a language disorder that impairs a person's ability to communicate effectively. In Tan's case, he is only able to produce the single syllable 'tan' due to a paralysis of his dominant arm preventing writing.
In addition, Tan's use of the syllable 'tan' may be influenced by his personal history and cultural association with his hometown. This demonstrates how personal history and culture can impact language use. Moreover, language itself can influence the way we think and perceive the world, as seen in differences between English and Mandarin Chinese speakers in terms of how they conceptualize time.