Jawaban:

I. I've lost my key (Saya [telahj kehilangan kunci) (what)

What have you lost?

2. Benny has gone to Hongkong (Benny sudah berangkat ke Hongkong) (when)

When has Benny gone to Hongkong?

3. Intan has finished her task (Intan sudah menyelesaikan tugasnya)how

How has Intan finished her task?

4. Anton and I have turned in the assignment (Saya dan Anton sudah mengumpulkan tugas) (who)

Who have turned in the assignment?

5. Intan has not moved to Jakarta with her family (Intan tidak pindah ke Jakarta bersama keluarganya) (why)

Why hasn't Intan moved to Jakarta with her family?

6. Tono has gone to Medan (Tono sudah berangkat ke Medan) (where)

Where has tono gone to?

7. Dina and Dony have stayed here (Dina dan Dony sudah (pernah) menetap disini)(who)

Who have ever stayed here?

8. I've eaten 5 times in a day (Saya sudah makan 5 kali sehari) (how)

How many times have you eaten in a day?

9. I have not had much money to build my new house. (why)

Why haven't you built your house yet?

10. She has not had breakfast before she left to her office. (?)

Has she had her breakfast before she left her office?

Penjelasan:

Semua kalimat pada jawaban di atas menggunakan pola Present Perfect Tense dan 5W1H Question Words:

(?) 5W1H (What/When/Who/Where/Why/How) + Have/Has + Subject + Verb-3 + Object + ?

kecuali nomor 10:

(?) Have/Has + Subject + Verb-3 + Object + ?

Semoga membantu ya.