Question Formation: Do/Does and Wh-Words

do/does appears only to make a question possible; क्या never changes at all

Hindi also has a word whose only job is to flag a yes/no question — क्या — but it behaves completely differently from do/does. क्या simply sits at the very front of an otherwise ordinary statement (तुम्हें चाय पसंद है → क्या तुम्हें चाय पसंद है?) and never conjugates, never carries tense, and is often dropped entirely in favor of rising intonation. English can't do this for ordinary verbs (like/eat/go), so it inserts a helper verb, do or does, that does conjugate — matching he/she/it with does — purely to hold the question's grammatical structure together: 'You like tea' becomes 'Do you like tea?', not 'Like you tea?'. Once do or does is inserted, the main verb drops back to its bare form, even for he/she/it (Does she like tea?, not Does she likes tea?). Wh-questions in both languages skip this front-marker: Hindi's wh-word alone signals the question, just as English's wh-word plus do together do.