being cold
The phrase 'estar resfriado' in Spanish does not directly translate to 'being cold' in English. Rather, it is used to express the state of 'having a cold' or 'being sick with a cold'. It's important to realize the distinction here, as 'cold' in English can imply two things: the temperature being low or a common illness. In this case, 'estar resfriado' refers to the latter.
I think I'm going to have a cold tomorrow.
This sentence is using the future tense to express the speaker's belief that they will have a cold tomorrow.
I cannot go to school because I think I am starting to have a cold.
In this example, the speaker uses the verb 'estar' in its present continuous form ('estoy empezando') to indicate the start of a new state or condition - in this case, the onset of a cold.
If it continues raining, we will soon have colds.
In this sentence, the speaker is speculating about the future ('vamos a estar') based on current conditions - in this case, their belief that continued rain will cause them to catch colds.