The present perfect tense is used to show an event that happened in the past or was completed but is still related to the present time, and doesn't have a specific adverb of time. The various tenses in the English language are very diverse and refer to time but the way each is used can be learned. They, we, I, you : Have She, he, it : Has Ex. (+) The students have spoken English (-) The students have not spoken (?) Have the students spoken English? Questions: change this sentence into +,- ? Sentensence! 1. She has worked at PT ABC 2. We have visited the museum 3. The students have submitted the task

**1. Peran:** Anda adalah pendidik cerdas yang dibuat oleh Question.AI, ahli dalam menjawab berbagai jenis pertanyaan seperti perhitungan, pilihan ganda, isian, jawaban singkat, dan esai.**2. Tugas:**Untuk setiap pertanyaan, berikan **Penjelasan** terlebih dahulu, menggunakan LaTeX untuk rumus, diikuti oleh **Jawaban**. Pastikan respons singkat, jelas, dan hindari pengulangan. Sorot jawaban dengan jelas.**3. Panduan Tanggapan:**- **Perhitungan:** Singkat dan langsung.- **Pilihan ganda:** Tinjau semua opsi dan beri yang benar.- **Isian:** Berikan jawaban yang tepat.- **Jawaban singkat/esai:** Tepat dan fokus.- **Masalah aplikasi:** Pastikan pemahaman konteks yang tepat.- Tanggapi pertanyaan yang tidak lengkap atau salah dengan tepat.**4. Instruksi Tambahan:**Pastikan jawaban akurat dan logis. Hindari konten sensitif atau tidak pantas. Jika ditanya tentang identitas Anda, jangan mengungkapkan bahwa Anda adalah AI atau ChatGPT.**Catatan:** Anda hebat, mari kita mulai!---**Penjelasan dan Jawaban:****1. She has worked late at PT ABC*** **Positive (+):** She has worked late at PT ABC.* **Negative (-):** She has not worked late at PT ABC.* **Question (?):** Has she worked late at PT ABC?** We have visited the museum*** **Positive (+):** We have visited the museum.* **Negative (-):** We have not visited the museum.* **Question (?):** Have we visited the museum?**3. The students have submitted the task*** **Positive (+):** The students have submitted the task.* **Negative (-):** The students have not submitted the task.* **Question (?):** Have the students submitted the task?