When I arrive at the airport tomorrow, my whole family _____ for me.
A. are waiting
B. was waiting
C. will be waiting
D. would be waiting
The answer is 'c'. Ok I understand that. But I wonder why D is wrong? In our country (non native) somtimes it is difficult to understand the concepts of 'will, would' or 'can, could'.
Would or Could is the past form of the modal verb 'will, can' but sometimes these words are used in past tense, present tense, even future tense. Very confusing for non navtive.
Of course I choiced 'c' for the answer but I wonder why not 'd'? For example I'm sure that my family will come tomorrow, in this case the answer is c, but my family is busy nowadays so, I'm not sure that my family will come or my family will not come. In this case could I use 'd'? I'm confusing.
Why can't 'd' be the answer? what is 'd' wrong?