Table 5. The most frequent function-word errors (The number in the curly brackets indicates omission errors)

FN subtype Word Freq. Error example Context
AUX-CONT ‘s (has) 53/206 (26%) {48} she’s been, nobody’s said, mistake’s been
AUX-CONT ’re (are) 13/51 (25%) your (9) understand you’re in
PREP under 11/51 (21%) on the (9) still under warranty
POSS our 8/51 (16%) {4} I (3) all our keyboard
AUX weren’t 8/51 (16%) won’t (3) that weren’t included
ART a 63/459 (14%) {24} the (19) with a one year
DEM these 7/51 (14%) this (4) These sorts of
CONJ and 12/102 (12%) n (8) (e.g., Kenten) Kent and Tracey
AUX could 6/51 (12%) {4} If you could contact
CONJ that 18/154 (12%) {11} possible that your / month that weren’t / know that your