I'm thirsty
It's dark
There's a lot of pollution
I've got a stomachache
I'm really tired
I'm dirty
It's raining
I've got an exam
I'm hungry
You should drink water
You should open your umbrella
You should study
You shouldn't eat sweets
You should use the public trasport
You should have a shower
You shouldn't turn off the light
You shoud go to bed
You should go to the doctor
