- You are to install an alarm system.
- What for?
- Well, there are burglars around here. They steal things from people's homes.
- Really?
- Yes, you should tell your parents.
- You're right. They should probably install an alarm system.
- And you have to be careful with the keys. Do not lose them or leave them near an open window.
- I do not think about it. You know, there's a lot of crime in urban areas these days.
- I think you're right. We must be careful.
- Yes, it is better to be on the safe side than to worry!