The notoriously difficult dental fricatives of English (the "th" sounds in these things) are dealt with by non-natives by undergoing a change in either place or manner of articulation. This means that the dental fricatives become dentalized labiodental fricatives ([f] or [v]) alveolar fricatives ([s] or [z]) or dentalized stops ([t] or [d]). Interestingly, speakers do not consistently choose one type of change over another, choosing to change place in one articulation while choosing manner in another. Listen to Cantonese 1 for an example of interdental change to [f] or [v].