Student or Learner
Why are these following sentences using -ing form? 1. I'm supposed to be thanking you; 2. It's a crisis and the government should be doing everything it can; 3. I hope you won't be getting under our feet this time. I mean what if I use the infinitives? ps: what if my question started ''why do these...use -ing form?''? Thank you for your help.
The two forms that you suggest tend to overlap somewhat. The present progressive implies that the action is already occurring ("in progress"), while the infinitive carries more of a sense of future or general action.
The clearest example is probably #2. If I say, "It's a crisis and the government should be doing everything it can", I'm implying that the government should already be acting. On the other hand, if I say, "It's a crisis and the government should do everything it can", I suggesting what the government should do (at some unspecified time).