急問現在進行式的問題

It cannot!!! You can say '' I am sitting on the floor of my house. '' 就可以代替 "I am standing on the floor of my house."

Present continuous tense can be used to show actions in the future time, especially when definite arrangements have been made for Mary to ask you in the scene where something happens,especially at home,at house:-
eg:-Mary said ,"What are you doing now ?"
---"I am standing on the floor of my house.
----I was sitting;
----I was not standing."
----I am sitting on the floor in my house
---Both later actions began and completed in the past without any connection with the present with Mary's asking.The action of present continuous is in progress now and at present "lee"

Present continuous tense can be used to show actions in the future time, especially when definite arrangements have been made for Mary to ask you in the scene where something happens,especially at home,at house:-
eg:-Mary said ,"What are you doing now ?"
---"I am standing on the floor of my house.
----I was sitting;
----I was not standing."
---Both later actions began and completed in the past without any connection with the present with Mary's asking.The action of present continuous is in progress now and at present "lee"

no but you can say I am sitting on the floor in my house