Jawaban:

1. the water in most rivers is unsafe to drink because of pollution

2. some people think Harry succeeded in business because of his charming personality rather than his business skills

3. my lecture notes were incomplete because the instructor talked too fast​

Penjelasan:

because ofdilanjutkan langsung denganobjek kalimat.

Dalam kalimat 1: because of pollution (pollution adalah objek kalimat)

Kalimat 2: some people think Harry succeeded in business because of his charming personality rather than his business skills

his charming personality adalah objek kalimat

Contoh lain:

I did not go because of the weather (weather adalah objek kalimat)

because (tanpa of) dilanjutkan dengan klausa (kumpulan kata-kata yang mempunyai subjek dan verb, yg bisa berdiri sendiri sebagai kalimat utuh)

Kalimat 3:

My lecture notes were incomplete because the instructor talked too fast​

Kita lihat, setelah becauseada klausulthe instructor talked too fast​ dimana kata-kata tersebut mempunyai fungsi sama dengan sebuah kalimat utuh.

Jadi kalau kita lepas klausa itu dan bikin satu kalimat tersendiri, sudah bisa:

The Instructor talked too fast.

Contoh lain:

I did not go because the weather was bad.

Setelah kata because, ada klausa the weather was bad, yang terlepas dari kalimat lengkapnya, sudah bisa berdiri sendiri sebagai satu kalimat.

Semoga bisa mengerti perbedaannya.