But for your help, he would have failed.
Without your help, he would have failed.
Had it not been for his help, I should have failed.
If it had not been for your help, he would have been ruined.
Without your help, he would have been ruined.
If it had not been for your support, he would have failed in business.
But for her help, he would have failed.
She would have failed but for his help.
She would have failed without his help.
But for your assistance, I could not have succeeded.
Had it not been for your advice he would have been ruined.
I don't think I could have got through, had it not been for his help.