What Is Probably True
Modal Verbs of Probability - Present
Modal verbs of probability express an opinion based on what a speaker knows about a situation at the moment of speaking. The following forms are used to speak about present situations.
Example:
It could be included in your bank deposit.
Susan might be able to countersign the loan.
You might be surprised to see the decision tree this time next month.
Present Forms
'Must' plus the verb expresses the idea that you are almost 100% sure of your opinion about a given situation.
Subject + must + base form of verb + objects
Example:
Net profit must be achieved before assets are depleted.
The accountant must be sure where to put a double entry in our books so everything can balance
Use 'might' or 'could' to express an opinion that you think has a good possibility of being true.
Subject + might / could + base form of verb + objects
Example:
Making consistent bank deposits each month could be the first step towards getting out of debt.
Susan might be able to countersign the loan.
'Can't' plus the verb expresses the idea that you are almost 100% sure that something is not true.
Subject + can't + base form of verb + objects
Example:
Jonathan can't be considering that stock deal.
Bob can't be confident that he had the correct check routing symbol.