but for后面指条件，不是从句，是短语（要不是……）相当于without
But for your help, he would have failed.
otherwise后是并列句，否则，如果转变成为带虚拟条件句的句子，这个就属于主句。
He got your help otherwise he would have failed.
=If he hadn't got your help, he would have failed.
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