Final answer:
The question pertains to the number of grammatically correct sentences that can be formed from a given grammar example in English. It involves understanding English syntax and grammar rules to recognize the correct arrangement of words in well-formed sentences. The example 'How did that happen?' illustrates how an intuitive knowledge of grammar leads to quickly identifying a grammatically correct sentence among various permutations of words.
Step-by-step explanation:
The question posed concerns the number of different grammatical sentences that can be generated from a given set of words based on the rules of grammar from a specified language grammar example. This falls within the study of English, particularly in the area of syntax, which is the set of rules, principles, and processes that govern the structure of sentences in a given language, especially with regard to the order and arrangement of words.
Understanding the rules of grammar and sentence structure allows us to recognize well-formed sentences among various permutations of words. In the example provided, the words 'that,' 'how,' 'happen,' 'did,' can only form one grammatically correct English sentence, which is 'How did that happen?'. Our innate understanding of grammatical rules helps us to dismiss incorrect word orders without conscious thought or deliberate parsing of each possible combination.
This concept is an important aspect of studying English and contributes to sentence fluency, comprehension, and the overall effectiveness of communication. Mastery of these rules enhances written expression, as demonstrated in the example where sentences are edited and condensed to improve clarity and conciseness.