1 I would like you to help me move the piano to the corner.

-> Do you mind helping me move the piano tp the corner

2 It isn't necessery to finish the work today.

-> You don't need/ have to finish the work today.

3 My sister finally managed to a job.

-> My sister finally succeeded in a job

4 Her brother repaired her car yesterday.

-> She had her brother repair her car yesterday

Or:

- She got her brother to repair her car yesterday

- She had / got her car repaired by her brother yesterday.