1 - (modal, auxiliary verb, defective) Used before a verb to indicate the simple future tense in the first person singular or plural.
2 - Used similarly to indicate determination or obligation in the second and third persons singular or plural.
3 - Used in questions with the first person singular or plural to suggest a possible future action.
1 - A statement of what ought to be the case as opposed to what is the case.
1 - To make a statement of what ought to be true, as opposed to reality.
1 - (auxiliary) Be obliged to; have an obligation to; indicates that the subject of the sentence has some obligation to execute the sentence predicate or that the speaker has some strong advice but has no authority to enforce it.
2 - (auxiliary) ought to; speaker's opinion, or advice that an action is correct, beneficial, or desirable.
3 - (auxiliary) Will be likely to (become or do something); indicates a degree of possibility or probability that the subject of the sentence is likely to execute the sentence predicate.
