Advice versus obligation: SHOULD vs MUST

1. Before watching the explanation on MUST and SHOULD, complete the sentences below. Use the words in brackets (recommend - important - strict - ought to):

• We use MUST when something is very .................................. . 
• We use SHOULD to .............................. something or when somebody ............................... do something. Then, it is not a ....................................... requirement.

2. SAMPLE CONVERSATIONS.

Again, before watching the video, try to complete the sentences with must or should. Then check your answers.

2.1 APARTMENT FORMALITIES

Glossary: 

lease: a contract by which property is conveyed to a person for a specified period, usually for rent.

• What documents ....................................................... (I / bring) to sign the lease for the apartment?
• You ........................................... (bring) some identity proof for the records and you .................................................. (bring / also) the cash advance.
• What time ..................................................... (I / come)?

2.2 COMPLAINING ABOUT LATE BUS SERVICE

• The bus ................ have been here 30 minutes ago.
• It ....................... be coming soon.
• It ..................., because I'm already late for work.

2.3 SOLUTIONS FOR THE ENVIRONMENT

• We ............................................. (stop) polluting the Earth!
• I agree. We .............................................. something about it.
• I think we ................................................. (use) cycles instead of cars to get places.
• We ..................................................... (not build) any more nuclear reactors.