To adjust something is to change it a little bit so that it's better. You might adjust the straps of your backpack so that it sits more comfortably on your back. You could adjust the lighting in your room so that you can see better as you read or do homework. If you see a mistake on your math homework, you can adjust your answer to make it correct. You can even adjust your thinking, adjust your method, and adjust your attitude: you change them a bit to make them work better for you.
Some animals adjust the color of their bodies to match their surroundings.
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When you wear something new, you may need to adjust it to make it comfortable: scoot it around until it feels just right.
Remember: when you adjust something, you make some changes to make it better. And when you adjust to a new situation, you make changes to how you think or what you do--and then the situation is better for you.
Idea 1: "I put on (a special piece of clothing), then adjust it until it feels and looks just right."
Idea 2: "I had to adjust my plans when (something went wrong somehow) and I couldn't (have something the way I wanted)."
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