Transform the following sentence so that its meaning is still retained but the pronoun is changed from singular to plural.
He had not done his homework.
They had not done their homework.
Complete the following task based on the instruction and optional input provided.### Instruction:
Transform the following sentence so that its meaning is still retained but the pronoun is changed from singular to plural.

### Input:
He had not done his homework.

### Output:
They had not done their homework.