Rules of the Pinyin (phonetics) <6>

Rules of the Pinyin (phonetics)
<6>

  1. There are a few characters which have no tone marks on them and they pronounce lightly:

吗 –- ma interrogative word
呢 –- ne interrogative word
了 –- le used after a verb to show the action is finished.
么 -- me a suffix.
的 -- de used after a noun to form an adjective.
你 们-- nǐ men some words just have no tone marks (meaning “you” )