I am sick.
Meaning: This means that the speaker is feeling sick. It's like saying, I have an illness or a condition that is making me feel unwell.
Choice of Words: I refers to the speaker, the person who is speaking. Am is a form of the verb to be, which indicates a state of being. Sick describes a condition of illness or poor health. When combined, "I am sick" expresses the speaker's current state of feeling unwell or having an illness.
Alternative Expressions
Related Expressions