Schwa

The schwa is a neutral vowel sound found in unstressed syllables. All five English vowels, as well as the semi-vowel Y, are sometimes pronounced as a schwa.

Subject pronouns

The subject of a sentence refers to the person or thing that performs the action of a verb. A subject pronoun is often used to replace this person or thing in subsequent sentences to avoid repetition.

Tense and aspect

"Tense" refers to the time period in which the verb of a sentence places an action. "Aspect" refers to the duration of an event within that tense.