Question

Which two sentences use a second-person pronoun?

She swam across the river.
Mason invited me to the party.
Your tree house is amazing!
You let me know if you need help.
The tailor measured her height.

Answer 1

the 3rd and 4th sentence

Step-by-step explanation:

second-person uses you/your/yours/you're pronouns

Answer 2

your tree house is amazing and you let me know if you need help

Step-by-step explanation:

second person is you, your and they