Choose the part of sentence that is grammatically incorrect :
That's twice I've been forgetting to bring my diary to work this week.

Question

Choose the part of sentence that is grammatically incorrect : 
That's twice I've been forgetting to bring my diary to work this week.

Accepted Answer

Option 2, "I've been forgetting," is grammatically incorrect because it uses the present perfect continuous tense inappropriately. The present perfect continuous tense (have/has been + verb-ing) is used to describe an action that started in the past and is continuing in the present, or an action that recently stopped but has present consequences. In this sentence, the speaker is referring to a repeated action within a specific timeframe ("this week").

Here's why "I've been forgetting" is wrong and how it should be corrected:

*   **Incorrect Usage:** The present perfect continuous implies a continuous, ongoing process of forgetting. While the speaker has forgotten multiple times, each instance of forgetting is a discrete event, not a continuous process.

*   **Correct Usage:** The correct tense to use here is the present perfect simple: "I've forgotten." This tense (have/has + past participle) is used to describe completed actions within a timeframe that extends to the present. "I've forgotten" emphasizes the *result* of the forgetting (the diary is not at work) and the fact that it has happened multiple times within the specified period. A better phrasing would be "That's twice I've forgotten to bring my diary to work this week."

Now, let's explain why the other options are grammatically correct:

*   **Option 1: "That's twice"** - This is a perfectly acceptable and common way to start a sentence indicating that something has happened two times. It's grammatically sound.

*   **Option 3: "to bring my diary"** - This is a correctly formed infinitive phrase acting as the object of the verb "forgetting." The infinitive "to bring" is used appropriately to express the purpose or action that was forgotten.

*   **Option 4: "to work this week"** - This prepositional phrase correctly modifies the verb "bring," indicating the location and timeframe of the action. The preposition "to" is used correctly to indicate direction or destination, and "this week" provides a specific time frame.