14. Can you speak English? (Inversion method: reversing the order of the subject and verb in a sentence to form a question.)
15. Are you tired? (Intonation method: using rising intonation at the end of a sentence to turn it into a question.)
16. Are they very shy? (Third method: using the auxiliary verb "do" to form a question in the present tense, i.e., "Do they very shy?"). However, it should be "Are they very shy?" as the sentence is about a state of being, not an action.
