Can you identify the grammatically incorrect sentence from each set ?

Question

Option 1: If he had been more careful, he wouldn't be in trouble now.

Option 2: She had completed the assignment before the deadline.

Option 3: I wish I knew the answer yesterday.

Option 4: He talks as though nothing had happened.

AfterBoards · Accepted Answer

**Option 3: "I wish I knew the answer yesterday."** is the grammatically incorrect sentence. The word **"yesterday"** tells us we're talking about the **past**. When we use "wish" for past situations, we must use the past perfect tense — "had known," not "knew." - ❌ I wish I knew the answer yesterday. - ✅ I wish I **had known** the answer yesterday. "Knew" with "wish" only works for present situations, e.g., *"I wish I knew the answer right now."* **Why the other options are correct:** - **Option 1** is a valid mixed conditional — past perfect ("had been") for a past cause, "wouldn't be" for a present result. - **Option 2** correctly uses the past perfect tense to show an action completed before another past point in time. - **Option 4** correctly pairs "as though" with the past perfect ("had happened") to describe something unreal.

Can you identify the grammatically incorrect sentence from each set ?

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