501. Let's go to the park. The sun is shining.
502. Grandpe is watching TV.
503. Listen! Somebody is knocking at the door.
504. Hush! I'm translating new words.
505. Look! The boys are climbing the tree.
506. Don't switch off the computer. I'm using it.
507. The boys like to run. They are running in the park now.
508. Excuse me. You're sitting on my chair.
509. I'm learning Text Five.
510. Look! The man is carrying a large bag.
511. We're having lunch.
512. The students are doing their homework.
513. The girls are playing tennis.
514. I'm cleaning the house.
515. I'm trying to open the door.