Final answer:
No, learning a new word is more probable than learning a new sentence because the acquisition of words is a simpler and more frequent event in daily life compared to understanding the complexities involved in full sentences.
Step-by-step explanation:
The question of whether the statements "I learned a new word today" and "I learned a new sentence today" are equally probable refers to the likelihood of language acquisition events.
Taking into account the basics of language development and acquisition, the answer to the question is No, because learning a new word is more probable. Words are the building blocks of sentences, and it is typically easier and more common to learn individual words than entire sentences.
Additionally, due to the innate biological predisposition towards language acquisition, as supported by Noam Chomsky's concept of a language acquisition device (LAD), individuals can learn words spontaneously and through immersion in a linguistic environment, while learning a sentence often requires understanding of grammar and context.
Moreover, learning a new word can occur as a separate event, while learning a new sentence usually involves knowing the words that comprise it.
The process of learning a word is simpler and can occur through various reinforcement methods such as repetition, whereas learning a sentence requires a deeper understanding of the syntax and semantics, which might involve more complex cognitive processes.
In summary, while both learning a new word and a new sentence are parts of language development, the chances of learning a new word are higher on a day-to-day basis.