Learner joins two clauses with exactly one link word, and stops pairing although with but or because with so.
Preview · progress not saved — Chapter 1 is free
Six sentences. Two of them carry two link words correctly.
Which is correct?
Two correct versions, why the fix feels bare, and the four pairs.
✓ Although the cost is high, it is worth paying.
✓ The cost is high, but it is worth paying.
Both are correct. Both together is not.
✗ Although the cost is high, but it is worth paying.
Delete either word. The meaning does not change.
A second rope that carries nothing and fouls the first.

The second rope carries nothing and fouls the first.
Ten sentences. Eight are doubled. Two are correct as written.
Although the cost is high, but it is worth paying. → delete
Because prices rose, so sales fell. → delete
Even though he studied hard, but he failed. → delete
While cities grew, but villages emptied. → delete
Since demand fell, therefore prices dropped. → delete
Despite the rain, but the match continued. → delete
Although the cost is high, the benefit, which arrives later, is greater. → delete
Prices rose and sales fell, but the company survived. → delete
Although the law changed, but enforcement did not. → delete
Because the line opened late, so the figures were poor. → delete
Three idea pairs, each written twice, one link word per version.
The scheme is popular. It loses money.
Version A: the scheme is popular, it loses money.
Version B: The scheme is popular, it loses money.
Fuel prices rose. Car use fell.
Version A: fuel prices rose, car use fell.
Version B: Fuel prices rose, car use fell.
The law changed. Enforcement did not improve.
Version A: the law changed, enforcement did not improve.
Version B: The law changed, enforcement did not improve.
One contradiction, two correct versions, one link word each.
Topic: online learning.
Think of two ideas that contradict each other.
Version 1: open with although. Version 2: use but in the middle instead.
Neither version may contain both.
One per line.
Count them before you submit.
Say which word you kept and whether the other would have worked.