The correct modals for the sentences are: 1. must, 2. must not, 3. should, 4. must, 5. can. Using modals appropriately conveys obligation, permission, or advice based on the context of each sentence. Understanding these nuances is key to mastering English modals.
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To supply the correct modal verbs in these sentences, we'll analyze what each sentence is implying.
You must be exhausted after your business trip. Come in and have a drink.
In this sentence, "must" is appropriate because it suggests a strong assumption or inference about the listener's state of being tired due to the mentioned trip.
Baggage must not be left unattended.
Here, "must not" expresses a necessity or obligation, indicating that it is imperative not to leave baggage unattended for safety reasons.
You should see the Intramuros and Luneta Park when you go to the Philippines.
"Should" is used here to give advice or a recommendation, suggesting that visiting these places is a good and advisable action when in the Philippines.
My doctor said that I must stop smoking or I'll risk serious problems.
The modal "must" conveys a strong obligation or necessity based on the advice of the doctor concerning health risks.
Tell your brother he can use my car for the delivery of parcels.
In this sentence, "can" is used to give permission, indicating that the brother is allowed to use the car for deliveries.