Should: 1. Advice 2. Logical deduction 1. "You should take an umbrella in case it rains." 2. "I've revised so I should be ready for the test."

Must, Mustn't: 1. Obligation 2. Logical deduction 3. Prohibition 1. "Dogs must be kept on a lead." "2. You must be tired after your long journey." 3. "You mustn't tell Alex. It's a surprise!"

Might Slight possibility : Past form of 'may' in reported speech. We might win a prize but I doubt it. "The President said he might come."

Helo Jackeline, Must, might and should are Modal Verbs. They precede a verb in a sentence and they are used in this specific structure: subject + modal + infinitive verb For example: I must eat. He might come. They should behave. They can also be used in a negative sentence or a question. You specifically asked about "must", "might" and "should", but I've also enclosed information about the other modal verbs, which hopefully you will find helpful. Modal verbs are used to nuance the meaning of a sentence. They give additional information about the function of the verb they precede: ability, advice, possibility, probability, permission or obligation. However, a modal verb can express different meanings, for example ability or permission, and only context will help you determine the meaning. For example: I can sing = I am able to sing = ability I can sing = I am allowed to sing = permission Please note that modal verbs have their counterparts in the past and conditional tenses: can / could shall / should (also: ought to) may / might will / would must / must Here is a quick summary of modals and their meaning: can / could: ability, permission, probability may / might: permission, possibility, probability will: strong probability (certainty or habit), obligation or willingness would: probability (habit), obligation or willingness shall: advice, obligation should: obligation / advice (recommended behaviour) must: obligation / strong probability (certainty) Additionally, "could" and "might" express a polite permission when used in a question: Could you pass me the salt? Might I suggest an idea? Should you have any more questions about modal verbs or any other specific grammar point, feel free to visit my teaching page and send me a message: https://www.italki.com/teacher/4812990 Micha.

Might is the past tense of may. Must and should have similar meanings, it means you are obliged to (you have to...). The difference is that you can use "must" to express an opinion about something that is very likely for example "you must be very naive to believe him after he lied to you serveral times". Whereas "should" is used to indicate the probability for example "I should have scored higher on this test, I studied so hard".