What is the function of using modals like "could", "need to", "should" in giving instructions?

A. To show the sequence.
B. To avoid being too direct.
C. To be clear.
D. To make sure whether the speaker is understood.

If you want to ask someone how to do something, you can say___________

A. Excuse me, could you show me how to make/use it?
B. I wonder if you could tell me how this works.
C. Excuse me, where is the nearest subway station?
D. Would you mind showing me how to use it?

When you want to make sure whether you are understood, you could say ___________

A. So is everyone clear on what they have to do?
B. OK,do you understand how this works now？
C. Does that make sense to you?
D. Any questions about what you need to do?

Which of the following words could be used when explaining something step by step?

A. first
B. next
C. second
D. finally

Match the English phrases with their Chinese meanings.