That are good sentences. However, you can using "aku" or "saya" depending the situation. Usually, "aku" used in nonformal condition or to people that familiar with you. Whereas "saya" used in formal condition or to people you respect.

Bahasa Indonesia mu cukup baik, :) terus berjuang!

Thanks for you corrections. I totally didn't even notice that I used "Aku" there. :)

Hello Shawn, Overall, all correct. Only need a lil bit further explanation for number 4 & 5. and also another explanation between number 2 and all number, there's a slightly difference in subject. 1. For number 2, in Bahasa sentences you write "Aku" instead of "Saya" as a subject. In this case, Aku and Saya is same as I in English. But, "Aku" is I in casual/informal form that used for someone we close with or younger. Whereas, "Saya" is formal form of I in Indonesia that used usually for older person, someone we meet for the first time, and for universal using. 2. In number 4 & 5 case, in the English sentences you used past verb "saw". However, in Indonesian we don't have any past verb. We specify the time instead, such as yesterday, last night, the day before yesterday etc to explain that the thing happen in the past. So far, your Indonesian is good and keep up the good work Cheers p.s. please correct me also if you see broken english :)