Citation:
Do-support refers to the grammatical construction in English where the auxiliary verb 'do' is used to form questions, negatives, and emphatic statements, especially in simple present and simple past tenses. This construction helps to maintain the syntactic structure of a sentence when the main verb does not have its own auxiliary. Do-support is particularly significant in the context of auxiliary and modal verbs as it demonstrates how English utilizes additional verbs to convey meaning and clarify sentence structure.