Grammar Quiz: Can You Identify The Modals?

The correct answer is "must" because it indicates a requirement or obligation. Taxi drivers are legally obligated to wear a seat belt for their own safety and the safety of their passengers. It is a necessary precaution to prevent injuries in case of accidents or sudden stops.

The word "must" indicates a strong obligation or necessity. In the context of the sentence, it implies that taxi drivers are required or obligated to know how to drive. This makes sense as driving is a fundamental skill that is essential for their profession. Therefore, the correct answer is "must".

The word "should" is the correct answer because it implies that it is advisable or recommended for taxi drivers to know their city well. While "can" suggests that it is possible for them to know their city well, and "must" implies a requirement or obligation, neither of these options capture the idea that knowing the city well is a desirable quality for a taxi driver.

Taxi drivers can give suggestions because they have knowledge about the local area and can provide recommendations on the best routes, attractions, and places to eat or visit. Additionally, they should give suggestions as it is part of their job to assist passengers and enhance their experience. However, it is not necessary or mandatory for taxi drivers to give suggestions, so the use of "must" is not appropriate in this context.

The correct answer is "can, should". The word "can" suggests that taxi drivers have the option to accept credit cards, indicating that it is not mandatory for them to do so. On the other hand, the word "should" implies that it is recommended or desirable for taxi drivers to accept credit cards as a convenient payment method for their passengers. Therefore, both "can" and "should" are appropriate choices to complete the sentence.