SICK and ILL
Son normalmente utilizados como adjetivos.
I feel sick.
Ed had to leave school early because he was ill.
Sick es comúnmente utilizado cuando sientes ganas de vomitar.
I think I’m going to be sick.
Mientras que ill se refiere a sentirse mal. Sin embargo, hay algunas frases que son comúnmente usadas en las que sick tiene un significado mas general.
I’ve been off sick for ten days – meaning I haven’t been to work/school for ten days because I’ve been feeling unwell.
Sick can also be used as a noun to refer to vomit. For example:
If you have children, you can be sure that you will have to clear some sick at least once during their childhood.