This is about compound words. A mailbox is a box where mail goes. The two words tell us its job.

We learn compound word meanings. A mailbox is a box where mail goes. The first word tells what goes inside.

We are learning compound words. Lunchtime means time to eat lunch. The two words tell us when we eat.

We put two words together here. Bedtime means the time to go to bed. It tells us when to sleep.

This tests CCSS.L.2.4.d (using knowledge of individual word meanings to predict the meaning of compound words). A compound word is made by putting two smaller words together to create a new word with a related meaning. To figure out what a compound word means, you can: (1) Look at the compound word, (2) Find the two smaller words inside it, (3) Think about what each small word means, (4) Put the meanings together logically to predict the compound word's meaning; common patterns include [Purpose] + [Object] like toothbrush = brush FOR teeth, [Location/Container] + [Thing] like doghouse = house FOR dog, [Descriptor] + [Noun] like rainbow = colorful bow/arc in rain, and [Time/Event] like birthday = day of birth; examples are doghouse (dog + house = house for a dog), notebook (note + book = book for writing notes), playground (play + ground = place/ground for playing), toothbrush (tooth + brush = brush for teeth), rainbow (rain + bow = colorful arc in rainy sky), sunflower (sun + flower = flower that faces/follows the sun). Choice A is correct because it combines the meanings of both component words logically: 'tooth' means a hard part in your mouth and 'brush' means a tool for cleaning, so 'toothbrush' means a brush for teeth. This shows understanding that compound words can be figured out by knowing what the individual parts mean and putting those meanings together in a way that makes sense. Choice B shows a reversed relationship by suggesting 'a tooth that is a brush' instead of a brush for a tooth; second graders often reverse the relationship or use only one part of the compound word. To help students, explicitly teach the strategy: (1) See compound word, (2) Find two small words, (3) Define each, (4) Put meanings together logically, (5) Check if it makes sense; model think-aloud like 'I see toothbrush, tooth is in mouth, brush is for cleaning, so toothbrush is for cleaning teeth.' Use visual separation like tooth|brush and practice building compounds like tooth + brush = toothbrush to predict meanings.

This tests CCSS.L.2.4.d (using knowledge of individual word meanings to predict the meaning of compound words). A compound word is made by putting two smaller words together to create a new word with a related meaning. To figure out what a compound word means, you can: (1) Look at the compound word, (2) Find the two smaller words inside it, (3) Think about what each small word means, (4) Put the meanings together logically to predict the compound word's meaning. Common patterns include [Purpose] + [Object] like toothbrush = brush FOR teeth, or [Location/Container] + [Thing] like doghouse = house FOR dog. Choice B is correct because it combines the meanings of both component words logically: tooth means the hard white part in your mouth and brush means a tool for cleaning, so toothbrush means a brush for teeth. This shows understanding that compound words can be figured out by knowing what the individual parts mean and putting those meanings together in a way that makes sense. Choice A shows using a wrong combination by reversing the relationship, like saying it's a tooth with a brush instead of a brush for teeth; second graders often reverse the relationship or use only one part of the compound word. To help students: Explicitly teach strategy: (1) See compound word, (2) Find two small words (cover each half, identify), (3) Define each small word separately, (4) Put meanings together logically, (5) Check - does it make sense? Model think-aloud: 'I see toothbrush. I can find two words: tooth and brush. A tooth is in your mouth. A brush is for cleaning. Put together: toothbrush is a brush for cleaning teeth - a brush FOR teeth. That makes sense!'

We figure out compound words here. A doghouse is a little house where a dog lives. The first word tells who lives there.

We learn compound word meanings. Bedtime means the time to go to bed. The two words tell us when something happens.

We learn compound word meanings. A notebook is a book for writing notes. You write your ideas there.

This asks about compound words. A mailbox is a box for mail. The mailman puts letters there.