Question

they _____be short of money (fill in blanks modals)​

Answer 1

They could be short of money

Detailed answer

Could is the most appropriate word to be used in this case.

• The word "Could" denotes that the person may be in short of money.
• This is the most grammatically correct word to be used in this case.
• The word could is usually used for denoting the possibility or probability of something happening.

• For example, if he had used any other word like, "should" it would be an incorrect sentence.