Why Might That Have Happened?
A 40-minute Kindergarten lesson on suggesting possible reasons for something that happened in the past.
Why Might That Have Happened? is a free 40-minute Kindergarten to Grade 2 social studies lesson plan for Common Core standard D2.His.14.K-2 — suggest reasons something happened in the past. It is timed across 5 sections, gives the exact wording to use where the wording carries the mathematics, names 3 misconceptions with the teaching move that addresses each, and ends with an exit ticket and a printable worksheet with its answer key.
- Grade:
- Kindergarten to Grade 2
- Length:
- 40 minutes
- Standard:
- D2.His.14.K-2
Kindergarten to Grade 2 · History
D2.His.14.K-2
Generate possible reasons for an event or development in the past.
Objective
Students will be able to suggest two possible reasons for something in the past.
Students are successful when they can
- Suggests a reason.
- Suggests a second, different one.
- Says these are possible, not certain.
What you need
- Photographs raising a why question
- The printable practice sheet linked at the end of this plan
The lesson
Warm-up — one window
5 min- Show the old classroom with one window. Ask why.
- Take every suggestion without judging.
Teach — more than one reason is possible
13 min- Write two different reasons for the one window.
- Say that both are possible and we do not know which is right.
- Introduce the word 'might' and use it in both.
- Add a third reason that could not be true, and say why.
- Say the historian's honesty: possible reasons, not certain ones.
“It might have been the cost. It might have been the weather. We do not know yet.”
Guided practice — two reasons each
12 min- Pairs take three past facts and give two possible reasons for each.
- They use 'might' each time.
- They mark the one they think is likeliest.
Independent practice
8 min- Students complete the why-might-that-be page.
- Read each fact aloud.
Close
2 min- Give a past fact. Take two possible reasons.
What goes wrong, and why
Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.
Gives one reason and treats it as certain.
Why: One good explanation feels sufficient.
Fix: Require two. A second possibility is what turns a guess into thinking.
Gives a reason that could not be true of that time.
Why: Present-day explanations come first.
Fix: Ask whether that existed then. Electricity is a common slip.
Says 'I do not know' and stops.
Why: Not knowing feels like the end.
Fix: Not knowing is where 'might' starts. Suggesting is allowed and expected.
If they are not there yet
- One reason rather than two.
- Give one reason and collect a second.
If they finish early
- Say what evidence would settle it.
- Rank three reasons by likelihood.
- Find a reason nobody else suggested.
Exit ticket
Long ago children walked to school. Give two reasons why that might be.
What to look for: Two different possibilities, hedged. One certain reason means the 'might' habit needs reinforcing.
Printable practice for D2.His.14.K-2
Free to print and copy, answer key included. Each sheet can generate a fresh set of problems for a retake.
- Why Might That Be?Circle the best answer.
Questions about Why Might That Have Happened?
How long does the Why Might That Have Happened? lesson take?
40 minutes, split across 5 timed sections: warm-up 5 min, teach 13 min, guided practice 12 min, independent practice 8 min, close 2 min. The minutes are stated per section and add up to the stated length, so the plan can be cut or extended at a section boundary rather than abandoned halfway.
Which standard does Why Might That Have Happened? teach?
D2.His.14.K-2 — D2.His.14.K-2, History for Kindergarten to Grade 2: “Generate possible reasons for an event or development in the past.” In plain terms, suggest reasons something happened in the past.
What do I need to teach this lesson?
Photographs raising a why question and the printable practice sheet linked at the end of this plan. Everything listed is either ordinary classroom equipment or a free printable from this site — there is nothing to buy and nothing to prepare beyond photocopying.
What mistakes should I expect in this lesson?
Three, each a reasoning error rather than carelessness: gives one reason and treats it as certain; gives a reason that could not be true of that time and says 'I do not know' and stops. The plan gives the thinking behind each one and the teaching move that addresses the thinking rather than the symptom.
How do I know whether the lesson worked?
The exit ticket asks: “Long ago children walked to school. Give two reasons why that might be.” Two different possibilities, hedged. One certain reason means the 'might' habit needs reinforcing. That tells you whether the class needs a reteach or a thirty-second conversation before you plan tomorrow.
Is there a worksheet to go with Why Might That Have Happened??
Yes — 1 printable D2.His.14.K-2 worksheet, linked at the end of the plan and free like the rest of the site. Each one comes with an answer key and 25 versions, so the practice after the lesson can be a different paper on every desk.
Is Why Might That Have Happened? free to use?
Yes. The plan, its printables and their answer keys are free to read, print and photocopy for your own class, with no account and no email capture. It was last reviewed on 7 September 2026. Please do not resell it or republish it as your own.
Last reviewed 2026-09-07. Aligned to D2.His.14.K-2 of the C3 Framework for Social Studies State Standards.