Intonation can be used to indicate the beginning of a sentence. 

Spoken American English varies widely across the country.

According to the International Phonetic Alphabet, there four degrees of vowel backness.

Dental consonants are divided into four groups.

Fall-rise intonation combines a fall followed by a rise.

The field of phonetics is traditionally divided into two sub-disciplines.

In American English rising tones are more common.

Vowel backness is associated with the back of the mouth.

When the vocal cords vibrate fully, the consonant is called voiceless.

Phonemes in many English words always correspond directly to the letters used to spell them.