Lh is pronounced like the ll in the English word “billiards” or in the French words “fille, bouilli”,as:

Nh is pronounced like the French gn in “espagne, peigner”, as:

Ph is pronounced like f, as: philosophia.

Rh and Th are pronounced like r and t.

6. The Diphthongs.

The Portuguese language has two kinds of diphthongs: the pure, those which are distinctly pronounced, and the nasal diphthongs, pronounced with a nasal sound.

Pure Diphthongs.