see，get，try，stop，sit，sing，的第三人称单数，现在分词和过去式

sees gets tries stops sits sings
seeing getting trying stopping sitting singing
saw got tried stopped sat sang

sees seeing saw
gets getting got
try trying tried
stops stopping stop
sits sitting sat
sings singing sung

sees gets tries stops sits sings
seeing getting trying stopping sitting singing
saw got tried stopped sat sang

sees seeing saw gets getting got try trying tried stops stop stop sits sit sit sings sung sung

sees - seeing- saw
gets -getting - got
tries - trying -tried
stops--stopping -stopped -
sits- -sitting-sat
sings- singing-sang