19. When is G silent?
Before m or n in the same syllable.
20. When is H silent?
After g or r in the same syllable; and h final after a vowel is always silent; also, in a few words after t, and initial in a few words.
21. When is L silent?
After a when followed by f, m, k, or v, except in the word valve; also, before d in could, etc.
22. When is M silent?
Before n in a few words.
23. When is N silent?
Final after l or m.