[A] They are going riding/skiing/sailing; Come dancing; I’m going shopping this afternoon. [B] He spends two hours (a day) travelling; He doesn’t spend much time preparing his lessons; We wasted a whole afternoon trying to repair the car; He spent a lot of money modernizing the house. [C] «She is/was busy packing.»
[[A] go y come pueden ir seguidos por los participios de verbos de actividad física y el verbo shop . [B] La construcción con spend y waste es: spend/waste + una expresión de tiempo o dinero + participio de presente. [C] be busy + participio de presente: «She is/was busy packing.»]
A Practical English Grammar (A.J. Thomson & A.V. Martinet) 