Adverb Clauses of Reason and Purpose

B1 · IntermediateNoun & Adverb Clauses

Since it was raining, we stayed inside. Take an umbrella in case it rains. Two different logical relationships.

What you'll learn

  • A reason clause explains why something already happened or is true
  • A purpose clause states a goal (so that) or a precaution against something that might happen (in case)
  • 'In case' is not the same as 'if' — it means preparing now for something that might happen later
  • Formal reason connectors: seeing that, given that — for the core because/since/as connectors, see Cause and Reason

Reason vs. purpose, side by side

Reason and purpose clauses can look similar, but they answer different questions. A reason clause answers 'why did this happen?' — looking backward at a cause. A purpose clause answers 'what for?' — looking forward at a goal or a precaution.

"Since it was raining, we stayed inside."
"I saved money so that I could travel."

Formal reason connectors: seeing that, given that

Beyond because/since/as, two more formal connectors introduce a reason clause, common in writing and careful speech: 'seeing that' and 'given that.'

"Seeing that the store was closed, we went home."
"Given that ticket prices have risen, fewer people are attending."

'In case' — a precaution, not a goal

'In case' introduces a precaution: you do something now to prepare for a possible event later. This is different from 'so that,' which states a goal you're actively working toward. It's also different from 'if,' which makes an action directly conditional on something happening.

"Take an umbrella in case it rains."
"Keep a copy of the document in case you lose the original."

Real English

"As she was tired, she went to bed early."
"She whispered so that no one would hear."
"Given that the roads were icy, we canceled the trip."
"Bring a charger in case your phone dies."

Watch out

✗If it rains, take an umbrella. (meant as a precaution taken now, not a real-time condition)
✓Take an umbrella in case it rains.

Use 'in case' for a precaution you take now for something that might happen later — 'if' makes the action directly conditional on the event.

✗Keep a copy of the document so that you lose the original.
✓Keep a copy of the document in case you lose the original.

'So that' states a goal you want to achieve — it doesn't fit a precaution against something unwanted, which needs 'in case.'

✗Seeing that everyone had arrived, so the meeting began.
✓Seeing that everyone had arrived, the meeting began.

Don't add 'so' after a reason clause — the main clause follows directly, without an extra connector.

Real life — Packing for a trip

"Did you pack everything?"

"I think so — I brought a jacket in case it gets cold."

"Smart. Seeing that the forecast looks unpredictable, maybe pack an umbrella too."

"Good call. I'll grab one so that we're covered either way."

Practice

Exercise 1 · Choose the reason clause

Choose the reason clause (explains why something already happened).

Exercise 2 · Choose the purpose clause

Choose the purpose clause (explains a future goal).

Exercise 3 · Choose the correct sentence

Choose the correct sentence with a formal reason connector.

Exercise 4 · Choose the correct sentence

Choose the correct sentence with 'in case' (precaution, not goal).

Exercise 5 · Choose the correct explanation

Choose the correct explanation of the difference between 'in case' and 'so that.'

Exercise 6 · Choose the correct sentence

Choose the correct sentence with 'given that.'

Exercise 7 · Choose the reason clause

Choose the reason clause.

Exercise 8 · Answer the cross-reference question

For the core because/since/as vs. because of/due to distinction, which lesson covers that in depth?

Exercise 9 · Combine as a reason clause

Combine as a reason clause: 'The flight was delayed. We missed the connection.' (use 'Since')

Exercise 10 · Combine as a purpose clause

Combine as a purpose clause with 'in case': 'Bring a charger. Your phone might die.'

Exercise 11 · Sort into groups

since it was raining
so that we could watch
as she was tired
in case it rains

0 / 4 sorted

Quick challenge

Five quick questions to check what stuck.

Question 1 / 5

Score: 0/0

Choose the reason clause.

You learned

  • A reason clause explains why something already happened or is true.
  • A purpose clause states a goal (so that) or a precaution (in case).
  • 'In case' means preparing now for something that might happen later — not the same as 'if.'
  • Formal reason connectors: seeing that, given that.

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