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:
Susan might be able to give the presentation on the articles of association.
The accountant must be sure where to put a double entry in our books so everything can balance
We can't be sure that this bank will always be at your service.
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:
That is a large amount of money for such a small bank to lend, so it might be a good idea to demand a confirmed letter of credit, in case the first bank cannot pay.
Susan might be able to give the presentation on the articles of association.
'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.
That bank deposit can't be from my company.