Peel the carrots and turnip and cut them into cubes. Wash the zucchini and cut it the same way. Trim and slice the celery along with its tops.
Bring 2 liters (8.45 cups) of water to a boil in a large pot with the crumbled bouillon cube, bay leaves, and thyme. Add the celery, carrots, and turnip, and cook for 10 minutes.
Drain the peeled tomatoes, reserving the juice for another use, and cut them into small pieces. Remove the leaves from the parsley and chop it. Drain the white beans.
Add the zucchini and green beans to the broth and continue cooking for another 10 minutes. Add the pasta during this cooking time, following the package instructions for the cooking time.
Add the white beans and tomatoes when there are only 2 minutes of cooking time left, then adjust the seasoning of the broth with salt and pepper.
Serve the soup hot in bowls and sprinkle with parsley.