Question

Someone knocked at the door ( convert into negative)

Answer 1

Explanation:

Someone has not knocked at the door

Tense:-

Tense denotes the time of action.They show when the work is done.They are

• Present tense
• Past tense
• Future tense

Present perfect tense:-

It is used to show an action started in the past and has just finished

Rules:-

Assertive:-

Sub+has/have+V3+obj

Negative:-

Sub+has/have+not+V3+obj

Interrogative:-

Has/have+Sub+V3+obj?

Interrogative negative:-

Has/Have+Sub+not+V3+Obj?

ex:-

She has written a letter

She has not written a letter

Has she written a letter?

Has she not written a letter?

Answer 2

Answer:-

$\sf\pink{⟶}$ Someone has not knocked at the door.

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Negative sentence:-

$\sf\blue{↪}$ A negative sentence (or statement) states that something is not true or incorrect.

Examples:-

$\sf\red{⇝}$ They don't practice yoga.

$\sf\purple{⇝}$ She did not like Bikhram yoga.

$\sf\green{⇝}$ He doesn't have to commute to work.

Positive sentence:-

$\sf\blue{↪}$ A positive sentence (PS) tells you that something is so.

Examples:-

$\sf\red{⇝}$ They practice yoga.

$\sf\purple{⇝}$ She likes Yin yoga.

$\sf\green{⇝}$ He has to commute to work.