I will have it done by tomorrow
Would you please by some example describe what does the bold part mean?
I think the bold part is passive, isn't it?
Thanks in advance
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This sentence is ambiguous: it may represent either of two related but syntactically distinct constructions.
It may be read as employing causative HAVE—this is the sort of construction which HostileFork describes. In this construction HAVE means cause and it takes a bare-infinitive clause as its complement; when the clause is cast in the passive voice, the infinitive be is deleted:
ACTIVE: I will have John paint the house.
PASSIVE: I will have the house
bepainted (by John). (The by phrase is optional.)
Alternatively, it may be read as employing resultative HAVE, in which HAVE has its ordinary sense of ‘possess, hold’ and the constituent following the direct object is a secondary complement describing the direct object. That constituent may be any construction which can act as a noun modifier: an adjective phrase, a preposition phrase, or a present or past participle phrase:
We have the system AdjPhrready to go.
We have the system PrepPhron stand-by.
We have the system PrePplPhrrunning smoothly.
We have the system PaPplPhrcompletely fixed.
I think your example is more likely to represent the resultative sense than the causative, but without more context it is impossible to be sure.
In either case, you are correct in thinking of done as some sort of passive: when the past participle of a transitive verb is employed as an adjective it has a passive sense, it describes the noun it modifies as ‘acted upon’. This is why some grammarians prefer to call this verbform a ‘passive participle’ in these situations.
Most of the time a sentence that looks like this is used, it means the same thing as:
I will finish it by tomorrow.
For instance: imagine your teacher asks when you are going to turn in an essay. If you say "I will have it done by tomorrow.", he will not think you are hiring someone else to do your homework!
This is a bit strange. Because usually when you speak about "having something done", you mean someone else will be doing it at your direction. For some reason, "I will have it done by (time)" came to mean "I will finish it by (time)" anyway.
It may have originally developed from wanting to emphasize "one way or another, it will be finished--no matter what it takes!" Not identifying who will be doing something makes things sound otherworldly and firm, think of: "It will be done." So perhaps wanting to sound firm is why it's the response to being asked about something you alone are responsible for (like homework).
Still, in certain contexts it actually does mean:
It will be done--by someone who is not me--and I will ensure this happens before tomorrow.
"I told you to hire some workers to come in here and fix the hole in the wall. When is that going to happen?"
"I will have it done by tomorrow."
So you have to look at context to know what the meaning is supposed to be.
Notice that if you say "I will have it done by April" that could either mean you will be doing it by the month of April, or you will be hiring someone named April to do it. :-)