Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States Department of Bioengineering, University of Pennsylvania, Philadelphia, ...

If you have a rhotic accent, you pronounce the /r/ sound whenever the letter 'r' appears in a word, like in 'learn', 'better' and 'perfect'. North American accents are usually rhotic, and other ...

Words with the letters 'ed' at the end are usually regular past tense verbs like 'started' or adjectives like ‘confused’. The pronunciation of 'ed' can change depending on which sound comes before it ...