Question

The children were playing in the garden.Change into present perfect.

Answer 1

$<b><i>Answer :-$

Structure of present perfect =>

Sub + has/have + v3 + object.

Now, your question :-

Q: The children were playing in the garden.
[ Now, It is in past continuous tense]

It's present perfect tense =>
=> The children have played in the garden.

Here,
Sub = The children
Has/ have = have ( because children is plural)
V3 = played
Object = in the garden