When we speak about something that is happening now, at the moment of speaking, we use the present continuous tense.
To make the present continuous, we use the auxiliary verb "to be" in the present tense (am/is/are) and the main verb + -ing ending.
|am/is/are + -ing|
running (the last consonant doubles in one-syllable verbs)
coming ("e" disappears)
lying (-ie becomes -ying)
You can read more on how to form and how to use the past continuous in the related topics.