To form questions in the present perfect tense, you need to invert the subject and the helping verb "have" or "has." The structure is:
Structure
Have/Has + subject + past participle (V3) + (rest of the sentence)?He has finished his homework. -> Has he finished his homework?
You have been to Singapore. -> Have you been to …
1. It, rain, today
2. You, lose, my wallet
3. You, not, finish, reading the book
4. We, decide, where to go
