sentence: The company immediately replied telling him that they were sorry that they did n't reply days earlier , but they could n't , since the system crashed and did n't allow them to send electronic mail , just to receive it .
modified: The company immediately replied telling him that they were sorry if they did n't reply days earlier , but they could n't since the system crashed and did n't allow them to send electronic mail , just to receive .
transformation: PREP, PUNCT, PRON