Please answer please my exam

Answers
Explanation:
To complete the sentences using present perfect form of the given verbs, we follow the structure used in present perfect sentences:
has/have + third form of the verb
- 'Has' is used with third person singular (he/she/it) while 'have' is used with third person plural (they), second person (you), and first person (I, we).
- Each verb in its root form undergoes change according to its tense. The perfect tense uses the third form of the verb, also referred to as the participle form of the verb.
Now, the answers:
1. Hitesh: Who has left the door open?
Radha: Manish has gone out to get some books.
→ The verb in the first bracket was leave, so according to the structure,
- we put has/have (has)
The answer cannot have been 'who have", since the subject Manish, introduced in the second dialogue, is third person singular and most likely the one who left the door open. You got it correct :D
- and the third form of leave (left).
→ 'Has going' cannot be correct in the second blank, because the third form of the verb 'go' is 'gone'. So, we just change 'going' to 'gone'.
2. Lakshmi: I think I have seen this film before.
Aarti: Oh no! We have already booked the the tickets.
→ In the first dialogue, the subject is first person (I) and the verb is see. So,
- between has and have, we choose have
- third form of see → seen
→ In the second dialogue, the subject is first person again (we) and the verb is book. So,
- we use have (for first person)
- third form of book → booked
We just change 'has' to 'have'. :)
3. Bhavya: Have you written to Grandpa?
Palash: Yes. Amol has sent him flowers too.
→ Here, the subject (you) is second person, so
- we use have
The verb (write)'s third form is 'written', so
- we use written
→ The subject is Amol, third person singular, which means
- we use has
The given verb's third form is 'sent', so
- we use sent
4. Diya: Papa, have our neighbours moved somewhere else?
Father: No. They have gone on a vacation.
→ The subject is 'neighbours', third person plural, so
- we use have
The third form of the verb move is moved, so
- we use moved
→ 'They', the subject is third person plural, so among has and have
- have should be used.
- and third form of 'go' → gone, we use.