The document discusses the present continuous tense in English grammar. The present continuous is used to describe actions that are happening now or ongoing. It is formed using the present form of the verb "to be" plus the verb ending in "-ing." Examples are provided such as "She is walking" and "He is playing the guitar." Spelling rules for adding "-ing" are also outlined, such as removing the final "e" from verbs ending in "e" or doubling the final consonant for short one-syllable verbs ending in a vowel-consonant combination.