a nifty tool to convert pinyin tone numbers to tone marks!as a test: gǔ zhī xué zhě bì yǒu shī shī zhě, suó yǐ chuán dào, shòu yè, jiě huò
as a test:
gǔ zhī xué zhě bì yǒu shī
shī zhě, suó yǐ chuán dào, shòu yè, jiě huò