In some countries, it's important ...
It's difficult...
Do we need...
I know you're tired, but try ...
We were late, so Tomo offered...
Be ready...
... not to fall asleep during the movie!
... to dress correctly in public.
...to change our money at the airport?
... not to forget people's names in a big class.
...to show your passport at check-in.
to drive us to the train station.