That can't be the president. The president wouldn't be shopping in Walmart.
Your sentence means 'Susy is not able to stay ...'.Only the second meaning is possible.I know that this works for situations in the present but what about negative deductions referring to the future like
'Tony cannot come to his sister's bithday party tonight because he is in hospital.' meaning that I conclude from Tony's situation that it is not possible or true he will be at his sister's birthday party tonight or would only this sentence be correct?
'Tony will not be able to come to his sister's birthday party because he is in hospital.'Only the second sentence is possible.What about in conditional sentences in which the main clause refers to the future like
'If my son ever breaks the table, we cannot use it.' or is there only one correct way of putting this sentence ' If my son ever breaks the table, we will not be able to use it.'
Student or Learner