Sure! Here are the sentences filled in with the correct verb forms:
They play soccer every Saturday morning.
By the time he finished the project, it was too late to submit.
Tomorrow, we will have a big celebration for my friend’s birthday.
Last week, I watched an amazing documentary about wildlife.
He has been studying French for three years now.
They have not played outside since it started raining.
In two days, I will take my final exams.
I have never seen such a beautiful sunset before.
While I was walking in the park, I found a lost puppy.
She has not finished her project yet.