Pronunciation: Assimilation
In connected speech, ten boys may be realised with /n/ becoming /m/ before /b/: /tem bɔɪz/. Green park may similarly have an /m/-like place before /p/. Careful /n/ is also acceptable. Read: Ten boys visited the green park. Assimilation is optional and context-sensitive; do not change spelling or force it in slow, careful speech.