1. Basic Inversion:
* For "yes/no" questions: Invert the subject and the first auxiliary verb (or "be" verb if there's no auxiliary).
* Declarative: He is going to the store.
* Interrogative: Is he going to the store?
* Declarative: They have finished their work.
* Interrogative: Have they finished their work?
* For "wh" questions (who, what, when, where, why, how): Place the "wh" word at the beginning, then invert the subject and auxiliary/be verb.
* Declarative: She went to the park yesterday.
* Interrogative: Where did she go yesterday?
* Declarative: He ate a hamburger.
* Interrogative: What did he eat?
2. Special Cases:
* Sentences with "be" as the main verb: Simply place "be" at the beginning.
* Declarative: He is a doctor.
* Interrogative: Is he a doctor?
* Sentences with modal verbs (can, could, will, would, should, may, might, must): Place the modal verb at the beginning.
* Declarative: She can swim.
* Interrogative: Can she swim?
* Sentences with "do/does/did" for emphasis: Inversion is the same as with the auxiliary verbs.
* Declarative: He does like pizza.
* Interrogative: Does he like pizza?
Important Notes:
* Question marks: Don't forget to add a question mark at the end of the interrogative sentence.
* Word order: Pay attention to word order, especially with adverbs like "never," "always," etc. They often shift position when forming questions.
* Subject pronouns: The subject pronoun may change depending on the type of question. For example, "He is..." becomes "Is he...?"
Examples:
* Declarative: The cat is sleeping on the couch.
* Interrogative (yes/no): Is the cat sleeping on the couch?
* Interrogative (wh): Where is the cat sleeping?
* Declarative: She will go to the party tonight.
* Interrogative (yes/no): Will she go to the party tonight?
* Interrogative (wh): When will she go to the party?
Practice and you'll become comfortable with the different ways to transform declarative sentences into interrogative ones!