going, waiting, running, yelling, going
Johnny is going to the front yard (Johnny - местоимение He)
His dog Rex is waiting for him (Rex - местоимение It)
Johnny is running around the house (Johnny - местоимение He)
Mom is yelling at Johnny and Rex (Mom - местоимение She)
He is going to the garage and gets his bike (местоимение He)
Допустим было бы предложение "They___(go) to buy a car", то в Present Continuous было бы "They are going to buy a car" (Местоимение - They)
Вспомним правила Present Continuous:
При местоимении I используется am + глагол+ing
При местоимениях He/She/It используется is + глагол+ing
При местоимениях You/They/We используется are + глагол+ing