be terribly hot
The phrase 'sehr heiß sein' in German is used to express that something or someone is extremely hot. This could refer to the weather, a room, a drink, or any other context where heat is involved. It's important to note that 'sehr' means 'very' and 'heiß' means 'hot', so the phrase is a direct translation of 'to be terribly hot'.
It must be very hot today.
This phrase is an assumption or expectation about the present weather conditions.
The water can be very hot.
This sentence provides a possibility or capability, noting that the temperature of the water has the potential to be high.
You look like you would be very hot.
This phrase is a perception about someone's present condition, specifically noting their appearance of being significantly warm.