Jawaban:

1. HaveIspent 2 hours here waiting for you?

2. Has she received the mail yet?

3. Has the meal been served? Let's eat.

Penjelasan:

Ketiga kalimat soal di atas adalah kalimat dalam present perfect tense

Seperti dijelaskan di jawaban soal sebelumnya, beda kalimat positif dari negative dalam tense present perfect tense ialah bahwa dalam kalimat negative ditambahkan kata not.

Sedangkan beda kalimat positive dengan interrogative adalah, posisi subjek dan auxiliary verb (have/has) bertukar, dan diakhiri dengan tanda tanya.

Positive: subjek + have/has + verb 3 + objek/keterangan

Negative: subjek + have/has + not + verb 3 + objek/keterangan

Maka interogative: Have/has + subjek + verb 3 + objek/keterangan?

Kembali ke soal:

1. I've spent 2 hours here waiting for you. (ini kalimat positive)

Note: I've itu adalah bentuk penulisan singkat dari "I have"

Jadi kalimat interrogative: HaveIspent 2 hours here waiting for you?

2. She hasn't received the mail yet.  (in ikalimat negative)

Note: hasn't adalah penulisan singkat dari "has not"

Jadi kalimat interrogative: Has she received the mail yet?

3. The meal has been served, let's eat. (ini kalimat positive)

Jadi kalimat interrogative: Has the meal been served? Let's eat.

Semoga bermanfaat.