Generally, if the subject and the word/s in the object/subject complement position can trade places, it is a subject complement. To survive was all she wanted.
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Df2006 In the following sentence:'All she wanted was to survive.' Is the phrase 'to survive' a subject complement or a direct object?Thanks.All (that) she wanted - a subject;
Df2006 But I was very surprised to find 'The Complete Idiot's Guide to Grammar and Style' identifying 'to survive' as the direct objectI would be surprised too. The linking verb does not take a direct object.