(Have to is used much more frequent

(Have to is used much more frequently in everday speech and writing than must.
Must is typically found in written instructions, as in (c). It is usually a strong, serious, “no nonsense” word.

Results (Indonesian) 1:

(Harus digunakan lebih sering dalam everday pidato dan menulis daripada harus.Harus biasanya ditemukan di instruksi tertulis, (c). Biasanya kuat, serius, kata "tidak ada omong kosong".

Results (Indonesian) 2:

(Harus digunakan lebih sering di everday berbicara dan menulis dari keharusan.
Harus biasanya ditemukan di instruksi tertulis, seperti dalam (c). Hal ini biasanya kuat, serius, "omong kosong" kata.