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 interested in seasonal work.
Craig can't be serious about cutting our hourly pay.
Coastal resort areas must be preparing for the hurricane.
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:
Coastal resort areas must be preparing for the hurricane.
Transportation companies must be concerned about the decline in oil production.
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:
Susan might be able to prepare the beverage.
Susan might be interested in seasonal work.
'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:
You can't expect we will reach full-capacity.
You can't deny that this is an on-property amenity.