Very different or opposite to intended meaning! E.g. 'I want to saw you every day.' ( = ’あなたを毎日、のこぎりで真っ二つにしたい。)
Problem with spelling or capitalisation, e.g. 'Munday, tuesday'
Problem with punctuation or spacing, e.g. 'I like, apples. pears andbananas.'
Wrong word order, e.g. 'I you love.' > 'I love you.'
Missing word(s), e.g. 'This flower _ beautiful.'
Extra word(s), e.g. 'An elderly old man'
Right word but wrong form, e.g. 'I loving you.' > 'I love you.'
Wrong word(s) (different meaning), e.g. 'Humans have 10 fingers on their feet' ('fingers' > 'toes')
Word doesn't fit with other word(s), e.g. 'on June' > 'in June'
This word not in the dictionary! E.g. 'speaked'
Problem with time, e.g. 'I remembered it tomorrow.'
Problem with number, e.g. 'one friends'
Meaning not clear: teacher is guessing, e.g. 'Go because elephant.' (? 'Get out of the way because an elephant is coming.')
Teacher cannot guess meaning, e.g. 'Happily because now elephant.'