0Vincent, good job. 02br 02br 01font 00Ali saw a thief trying to steal the car parked outside 01del 00the02del 00 John's house. He immediately called the police.
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01cite10Vincent Teo12cite12br
10Can I say,12br
12br
10(a) The owner thanked John to help him to save his car. 11b10No12b12br
12br
10(b) The owner thanked John for helping him to save his car. 11b10Yes, but the "to" is not necessary, and I would omit it.12b12