I (pronoun)

1. used by a speaker to refer to himself or herself
2. used to represent the speaker in a formal context

Origin:

Old english ic, of germanic origin; related to dutch ik and german ich.

Examples:

1. I am going to the store.
2. I am feeling tired.
3. I love ice cream.
4. I think it will rain.
5. I am happy to see you.