Subject

In English, the subject of a sentence must be expressed.

The 1st person singular I is always written with a capital letter, no matter where it stands in a sentence.

The 2nd person you is the same in the singular and plural. We use it to address another person, or more people.

The 3rd person singular he and she stand for already mentioned male and female person, whereas it refers to a thing, animal or a place. These forms have the same plural form - they, which can also mean 'people', 'the authorities' or 'someone else, not me'.

The 1st person plural we can include the listener or not, but it also means 'anyone / everyone'.

Subject pronouns almost always come before a verb in statements, except after to be (This is she speaking).