Question

Choose the appropriate modal verbs to complete the sentences. 1. Sir, don't you know that when flying you (have to/must) show you passport. 2. I(have to/must) be at the meeting at 6 p.m. so I can't join you for dinner. 3.there are many guests in the house, George will (have to/must) sleep on the sofa 4. People (have to/must) realize there are limits to what we can do.

Answer 1

1. Sir, don't you know that when flying you (must) show you passport.
2. I (must) be at the meeting at 6 p.m. so I can't join you for dinner.
3. There are many guests in the house, George will (have to) sleep on the sofa
4. People (must) realize there are limits to what we can do.

Answer 2

1. Sir, don't you know that when flying you have to show your passport. 2. I have to be at the meeting at 6 p.m. so I can't join you for dinner. 3. There are many guests in the house, George will have to sleep on the sofa. 4. People have to realize there are limits to what we can do.

In these sentences, the appropriate modal verbs to complete the sentences are "have to" and "must". Both "have to" and "must" can be used to express obligation or necessity. However, there are some slight differences in usage.

- "Have to" is used to express external obligations or requirements. It suggests that there is a rule, regulation, or external authority that requires the action. For example, in sentence 1, when flying, it is a requirement to show your passport. - "Must" is used to express personal obligations or strong recommendations. It indicates that the speaker feels that something is necessary based on their own judgment or opinion. For example, in sentence 2, the speaker has a personal obligation to be at the meeting at 6 p.m.

In sentence 3, both "have to" and "must" could be used interchangeably. However, "have to" is more commonly used in this context to express the external obligation of accommodating the guests.

In sentence 4, "have to" is used to emphasize the general necessity or obligation for people to understand the limits of what can be done.

It's worth noting that "must" is generally considered more formal than "have to". Both modal verbs can be used interchangeably in many cases, but it's important to consider the specific context and the level of formality desired.