Read the sentences. "You must talk to your manager." "We have to pay tax." "I need to get up early." What do these expressions have in common?, They express permission., They express possibility., They express advice., They express necessity or obligation., Compare the sentences. "You don't have to finish the report today." "You mustn't use your mobile phone on the plane." What is the difference?, Both give advice., The first means it isn't necessary; the second means it isn't allowed., Both mean the same thing., The first is stronger than the second., Read the sentence. "You don't need to bring a laptop." What does this mean?, Bringing a laptop is optional., Bringing a laptop is prohibited., Bringing a laptop is impossible., Bringing a laptop is required., Read the sentence. "You mustn't use your mobile phone when you're on the plane." What does mustn't express?, Advice., A possibility., A prohibition., A suggestion., Compare the sentences. "We must leave soon." "We had to leave early yesterday." Why is had to used?, Because the situation is in the past., Because it gives advice., Because it is stronger than must., Because it expresses permission., Read the sentences. "You should come to work in smart clothes." "You shouldn't arrive late to meetings." What do should and shouldn't express?, Rules., Ability., Advice., Permission., Read the question. "Should I wear a tie?" What is the speaker asking for?, A rule., Advice., Permission., An obligation., Compare the sentences. "You must ask your manager." "You should ask your manager." What is the main difference?, Must expresses permission., They have exactly the same meaning., Should expresses prohibition., Must is stronger than should., Look at the examples. "We must get there on time." "You should ask Helen." What do both sentences have in common?, They express permission., Both use to after the modal., The modal is followed by the infinitive without to., Both are in the past., Choose the correct conclusion. Which expression means it is not necessary?, Don't have to., Shouldn't., Had to., Mustn't., Choose the correct conclusion. Which expression means it is not allowed?, Don't need to., Mustn't., Shouldn't., Needn't., Complete the rule. After must and should, we use..., the -ing form., the past participle., the infinitive with to., the infinitive without to.

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