you <will> <would> <_> have to add an "a" "I am doctor." 1. To make the sentence grammatical, you have to add an "a" before "doctor." 2. To make the sentence grammatical, you'll have to add an "a" before "doctor." 3. To make the sentence grammatical, you'd have to add an "a" before "doctor." Are all three sentences correct? The question is about the numbered sentences. "I am doctor" is just an example. Imagine me writing this on some English learning site.