Question

She composed 2 songs.into passive
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Answer 1

2 songs were composed by her.

Step-by-step explanation:

In passive, we put the object first, then verb to be according to the verb in active.

For example if the verb in active was present, we put (is/are)

if the verb in active was past, we put (was/were).

Then, we put by and the subject but it's not necessary, you may put it or not.