Don't/didn't become a climber? 1.I don't/didn't become a serious climber until the fifth grade, when I went up to rescue a kite that was stuck in the branches of a tree. Which word is correct? don't or didn't? And why? I think "didn't" is correct, right? 2.I walked in our garden when/while Tom and Jim were trying a big sign onto one of the trees. Which word am I supposed to choose? When or while? And why? Thank you in advance.