Ответ:

Last summer Mr. Jones traveled in Africa. He has a very expensive gun with him. He reached a place in the jungle where elephants usually gather. He tells about the place by the hunters. There he sees three big elephants and a baby elephant play peacefully with one another. At the sight of his gun the big elephants run away, but the baby leaves behind. He has a thorn in his back. Mr. Jones laid the gun on the ground and pulled out the thorn. The animal wind the trunk round Mr. Jones and kissed him. Then he is gone.

Six months later Mr. Jones comes to enjoy a circus performance. A small elephant goes straight to Mr. Jones, who sitы in front, and holds him tight with his trunk.

я так понимаю, надо глаголам проставить правильное спряжение.

не знаю, почему у Вас нумерация с 0(?), но я так и оставила

0) I have - He has

1) they gather

2) I tell - he tells

3) I see - he sees

4) they play

5) they run

... дальше, там всё в таком же духе, наверное, Вы уже поняли

10) "be" меняется как: I am, You are, He is

13) правильнее не "who sits", а "which sits"