What's the subject?
I am.
I
I kicked the ball.
kicked
I threw the ball.
ball
I gave the ball to him.
him
He went north.
He.
We thought about it for a while.
thought
I threw the ball to him.
ball
I gave my brother an ice cream.
my brother
After a while, Tony knew the answer.
Did you ever really love her?
love
I forgot my suitcase at the office.
suitcase
When you get this letter, send it to Panama.
Panama.
Although it was late, Jack and Jill went to the movies.
Jack and Jill
He isn't my actual brother.
isn't (is not)
I gave my brother an ice cream.
ice cream.
If you go that way, take an umbrella for the rain.
rain.
Who rode the bus this morning?
Who
We are the only ones left.
the only ones left.
To whom it may concern, help me.
whom it may concern