they say write a sentence about something you like about stars. underline the verb make it agrees with the subject of the sentence.

and my son write

stars are really shiny,and really
bright. also i like about stars is that they help with directions.

my son underline the are word i just want to now any mistake or all correct

Your son is correct.

Your son correctly underlined the verb "are" in the sentence "stars are really shiny, and really bright." This verb agrees with the plural subject "stars" because they both refer to multiple objects. Therefore, there is no mistake in this sentence. Great job to your son!