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When analyzing this sentence, I wrote that "our first black prime minister" is the direct object of the verb "tipped" and have had this marked wrong, DO (direct object has been crossed out and been corrected to SC (subject complement).
I can see that obviously "David Lammay" and "our first black prime minister" are referring to the same person, so I can follow the correction up to a point, but can anyone tell me why, it was wrong to analyze "our first black prime minister" as the DO oc "tipped"?
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"Some people sometimes tip David Lammay as our first black prime minister" is the active form of the idea. Here "David Lammay" is the direct object and "our first black prime minister" is an object complement.

But when the passive form is made from that active form (by means of the usual process of making the direct object the subject), we have "David Lammay is sometimes tipped as our first black prime minister (by some people)".

Now "David Lammay" is the subject and there is no direct object left. The only thing "our first black prime minister" can become is a subject complement, because now it refers to the same person that "David Lammay", the subject, refers to.

Removing the "is" to form a subordinate construction from this sentence does not change the analysis, so in "David Lammay, sometimes tipped as our first black prime minister, ..." , the subject and subject complement labels still apply.

Emotion: geeked