Question

they have been forgetting the answer - convert into wh question​

Answer 1

Heya,

The answer to your question is :

Why have been they forgetting the answer?

Regards,

Kshitij.

Answer 2

Answer:

Present perfect continuous: form

We use have/has + been + the -ing form of the verb.

Present perfect continuous: uses

Recent past activities

We use the present perfect continuous to talk about a finished activity in the recent past. Using the present perfect continuous focuses on the activity.

We don’t give a specific time. Even though the activity is finished, we can see the result in the present:

** I’ve just been cleaning the car. (The car is wet and clean.)

**  It’s been snowing. (The ground is covered in snow.)

We use the present perfect continuous for a single activity that began at a point in the past and is still continuing:

** I’ve been reading your book – it’s great. (I’m still reading it.)

** He’s been living in the village since 1995. (He is still living in the village.)

How long …?

We often use the present perfect continuous to ask and answer questions about the duration of an activity. We use the question How long …+ present perfect continuous:

A:  How long have you been waiting for me?

B:  About ten minutes. Not too long. (I’ve been waiting for about ten minutes.)

Figure it out now. It will help you to study this tense and it's uses.

Good Luck dear!!