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What’s the subject for the verb suppose?

Now, yer mum an’ dad were as good a witch an’ wizard as I ever knew. Head boy an’ girl at Hogwarts in their day! Suppose the myst’ry is why You-Know-Who never tried to get ‘em on his side before. . . probably knew they were too close ter Dumbledore ter want anythin’ ter do with the Dark Side.

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closed as general reference by Kris, Andrew Leach, Roaring Fish, JSBձոգչ, MετάEd Nov 8 '12 at 16:25

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

If you have tried to find an answer to the question, let us know. – Kris Nov 8 '12 at 11:13
Related: Is it acceptable to begin a declarative sentence with “Am”? and the questions linked from there. – RegDwigнt Nov 8 '12 at 11:23
up vote 5 down vote accepted

The subject of "suppose" is "I". It's been elided from the sentence. This is quite common in informal speaking and even in writing. "Hope this helps" = "I hope this helps".

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Yes, while reading Harry Potter, I've gotta try to find out what the subject of this verb many times. Especially in Hagird's words, i can hardly find them. – Listenever Nov 15 '12 at 23:41

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