Question

We are obliged to renew our passports.
We
I advise you to go on the bus tour.
You
It's not necessary for them to walk to the station.
They
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Answer 1

We are obliged to renew our passports.

→ We have to renew our passports.

I advise you to go on the bus tour.

→ You should go on the bus tour.

It's not necessary for them to walk to the station.

→ They don't have to walk to the station.