while i am away为什么不加ing

while i am away为什么不加ing while i am away I am calling 110 for help now.for不是介词吗?为什么help不加ing? I am sleeping为什么结尾不直接用SLEEP而要加ING那? I am still watching TV.动词为什么加ing I am considering changing my job.为什么concider加ing i like swimming为什么加ing而i can swim为什么不加ing i am always thinking.为什么要am.为什么要加ing. While I am away,please help me_____my dog -_____you look after my baby while I am away?-___________ I am feeding the geese中的feed可以不加ing吗? 在please look after my clothes when i am away.中,为什么i am后面加副词a