Question

--Is Jim at home by himself?

--No. There’s another boy ________ with him.

1. A.
   playing
2. B.
   play
3. C.
   plays
4. D.
   to play

Answer 1

A
在there be结构中不管前面的时态如何，后面修饰主语的定语一般都要用“动词+ing形式”。