I want to emphasize that I only have 5 dollars, so can I use the sentence:
Five dollars is all I have.
Or must it be:
Five dollars are all I have.
Please give the explanation as well.
It all depends on the context. If we refer to five dollars as a single entity, then the verb that follows must be singular. If we refer to “five dollars” as five separate pieces of 1 dollar , then the verb must be plural.
Source : Link , Question Author : Tyler Bean , Answer Author : Mohamed Rachidi