I spent two hours walking there.中的walking为什么用ing形式

I spent two hours doing my homework yesterday什么意思 I spent two hours ____(finish) my homework yesterday. I spent two hours on my homework.同义句 I spent two hours cleaning my room 改为同义句 I spent two hours in___(finish)this task I spent two hours making the cake.(同义句转换) I spent two hours with my homework.这句话对吗 What I spent almost two hours here for? ( I spent two hours ______ my report.I spent two hours ______ my report.A.to writeB.writtenC.writingD.write I spent two hours on my homework一句中spend为什么要用过去式spent I spent two hours on my homework.(改为同义句)It _______________ me two hours ________________ do my homework. I spent two hours in cleaning up our bedrooms改为同义句 It () me two hours ( ) ( ) ( ) our bedrooms I spent two hours doing the morning exercise的同义句 I spent two hours doing my homework yesterday.(改为同义句） I spent two hours doing my homework last night的同义句--------- ----------- ---------- ------------ ----------- ----------- --------- my homework last night I spent two hours walking there.中的walking为什么用ing形式 I spent（ ）（for;about）two hours on my homework last night I spent two hours working out this problem.(改为同义句)