because of vs. because

Can you fix this sentence? Ali got tired because of his shopping business did not take off.
Bisakah kamu memperbaiki kalimat ini? Ali got tired because of his shopping business did not take off.
First of all, there is a minor spelling mistake in business which we can fix straight away.
Pertama, ada sedikit kesalahan ejaan pada kata business yang bisa langsung kita perbaiki.
Because of is always followed by a noun phrase.
Because of selalu diikuti oleh frasa nomina.
For example, I was late today because of the heavy traffic.
Misalnya, aku terlambat hari ini karena lalu lintas yang padat.
Whereas because is followed by subject plus verb.
Sedangkan because diikuti oleh subjek dan kata kerja.
For example, I was late today because there was heavy traffic.
Contohnya, aku terlambat hari ini karena lalu lintas sedang padat.
So let's fix that sentence. Ali got tired because his shopping business did not take off.
Jadi mari kita perbaiki kalimat itu: Ali merasa lelah karena bisnis belanjanya tidak berkembang.
What should go in the space? I bought a sandwich ____ I was hungry.
Apa jawaban yang tepat?
Notes
1. Because → diikuti subject + verb
Menjelaskan alasan dengan klausa penuh.
I stayed home because it was raining.
= Aku tetap di rumah karena sedang hujan.
She is happy because she passed the exam.
= Dia senang karena dia lulus ujian.
2. Because of → diikuti noun / noun phrase
Menjelaskan alasan dengan frasa benda.
I stayed home because of the rain.
= Aku tetap di rumah karena hujan.
The match was canceled because of bad weather.
= Pertandingan dibatalkan karena cuaca buruk.