Instead of learning the phonic rules for tones consciously, the learners are recommended to learn only the relationship between the consonant-vowel spelling and the pronunciation of the whole word.
the learners should be told that they must remember the tone mark as part of the spelling by heart without linking to its actual pronunciation of tone: "Just treat the tone mark of each syllable as a kind of decoration on one hand, and remember the tone of each syllable on the other hand."