Why This Mistake Matters

Students are often told to make writing concise. That is useful, but revising/editing questions do not reward shortness by itself.

The trap is that a short combined sentence may drop a cause, change who did the action, or create a grammar problem. The best answer is clear and concise, not merely short.

The Student Move

Before choosing an answer, have the student say what relationship must stay in the sentence: cause, contrast, time order, example, or description.

Then check each answer for two things: did it keep the original meaning, and is the sentence grammatically clean?

One-Question Practice

Question: Which revision combines the sentences most clearly without changing the meaning? The robotics team redesigned the wheel mounts. The new mounts reduced friction. The robot turned more smoothly during the final trial.

Correct answer: The robot turned more smoothly during the final trial after the robotics team redesigned the wheel mounts to reduce friction.

Why: this answer keeps the cause-and-result relationship clear. Some shorter choices create a comma splice, make the wheel mounts seem to redesign something, or leave out why the robot improved.

What to Watch For Next

If your child misses this kind of item, ask them to explain what changed from the original sentences. A wrong answer often sounds smooth but quietly changes the logic.

If sentence combining is hard along with transitions, pronouns, or punctuation, use the free grammar sample next. If the weak spot is unclear, use the $1.99 diagnostic to map both ELA and math before choosing the next practice block.