We would explain the things the children’s understanding in a simple way.

s the matter with you, Lucy—After the long walk, my legs ___________and I couldn’t go any farther

Yesterday I lost my pen. I couldn’t find_______. —Oh, it’s a pity. You’d better buy ________ this afternoon.

He has been in bed ______ he fell off his bike a week ago

The doctor strongly recommended that he ________ a holiday