What do you call the places in a sentence where a particular grammatical form is required for correctness?

• A. Obligatory contexts
• B. Pattern practice drill
• C. Phonemic
• D. Procedural knowledge

Answer: (A)

Places in a sentence where a particular grammatical form is required are called obligatory contexts. These are the environments in which a rule dictates a specific form, and using a different form would make the sentence ungrammatical or unclear. For example, in English, the present-tense third-person singular form often requires an -s (she walks), so that -s ending appears in that obligatory context. In languages with case marking, a noun must take a certain case depending on its role in the sentence, which is another example of an obligatory context. The other terms describe teaching methods (pattern practice drill), sounds (phonemic), or general know-how (procedural knowledge), none of which name the habitats where grammar must appear in a sentence.