Learner keeps one time frame across a sentence containing two or more verbs, which is where Band 5 complex sentences break.
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Six sentences. Two of the mixes are deliberate.
When the factory closed, many families move away. What is wrong?
Where the slip happens, why the link word does not help, and the legitimate mix.
✗ When the factory closed, many families move away.
✓ When the factory closed, many families moved away.
You set the time with the first verb and lost it with the second.
The slip is almost always in the second half.
Five matching clocks, and one that does not.

Five clocks, one wrong. The others never moved.
Twelve sentences. Six mix two times on purpose.
Sort each item into the correct category
Three chains. One is correct as written.
1. When the factory closed, many families ______ away.
The first verb is .
So the second verb is .
2. Although the law changed in 2015, enforcement ______ weak ever since.
The first verb is .
Ever since means it continues, so the second verb is .
3. Because the scheme works, the council ______ it last year.
The first verb is .
Last year is finished, so the second verb is .
Ten sentences. Three mix two times correctly.
When the factory closed, many families move () away.
Although prices rose sharply, demand stay () the same.
Because the scheme work (), the council extended it last year.
After the trial ended, the council publish () the results.
The report showed that costs rise () faster than wages.
While cities grew, villages empty ().
Since the law changed in 2015, enforcement improve ().
Before the ban took effect, traffic be () heavy all day.
They discovered that the method still work ().
When the results arrived, nobody be () surprised.