"the teen walked along the beach with his mom, though neither one spoke to the other. the son kept glancing at his mother, sometimes with a furrowed brow, other times with wide eyes. he would start to open his mouth, but then would hastily close it again. his mother continued her steady walking, considering him out of the corner of her eye. sometimes she smiled a thin smile, but generally she kept her mouth closed."

first person

second person

third-person limited

third-person objective

third-person omniscient

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.