I'm not sure if this would make sense for you, but it might be better to avoid thinking of would (and even will!) as a tense.
I have two main reasons for that. One is that it could simplify things a lot for learners to think of would and will as modal verbs, rather than to think of them the way we think of other auxiliary verbs (such as be or do) or main verbs, which will normally indicate the tense. (In other words, it's better to think of will/would the same way that you think of shall/should, can/could, and may/might) The other is that it is simpler to think of English tense system as a two-tense one, i.e. past and non-past. (This is too complex to discuss in this question, in my opinion, but it could nudge you in the right direction a little.)
Back to your sentence,
"The reception would be held in that house."
It would be better to have a more complete context, so that we could discuss it more appropriately. However, I think it's enough for our discussion to assume that it's something someone says in a dialogue. Suppose that that is the case. It means that this would is used for saying or asking what someone thinks about a possible situation (sense 3).
In what tense is it? To me, it has no tense. (This might disagree with your grammar books, but it's simpler this way.) It is something someone says in the present while that someone is thinking of a possible situation in the foreseeable future.
Would has several uses. An extremely simplified explanation of would is that it is the "less definite" form of will. It can be used as the past tense of will. It can be used in hypothetical thinking, and conditionals (those if-clauses, particularly those that you might know them as Conditional Type II) can be considered hypothetical. It can be used to put a distance between what we say and the reality, which is a way to make what we say sound more polite, because it's indirect. (For example, "I'd like to ...", "Would you mind ...?")
I hope that that should be enough to cover this question. However, please keep in mind that there might be more to would than what I've just discussed that I might have overlooked.
Using this as a reference, these sound OK, with the exception of "have to" but only because repeating "have" twice like that sounds a bit jarring.
I ought to have finished the homework by the end of the week.
I have to have finished the homework by the end of the week.
I shall have finished the homework by the end of the week.
I have heard this before, it sounds a bit awkward but makes sense.
I had better (typically "I'd better") have finished the homework by the end of the week.
I have also heard this before, it sounds quite awkward but still makes a bit of sense.
I have got to (typically "I've got to") have finished the homework by the end of the week.
This ...
I must have finished the homework by the end of the week.
I must not have finished the homework by the end of the week.
sounds like you are just discovering you have or have not done the homework, rather than using "must" to communicate a requirement or obligation.
However, usually all these sentences are arranged like this, which sounds much more natural to me.
I ought to have the homework finished by the end of the week
And all the modals "work", including the ones not mentioned above, if you keep the sentence like that:
I can(n't)/could(n't)/must(n't)/might (not)/may (not) have the homework finished by the end of the week.
(Even though "I must not have the homework finished by the end of the week" - meaning I am required to not have my homework finished by the end of the week - is a peculiar situation to be in - that would be the right way to say it.)
Best Answer
is milder and less direct in tone than
The form with "would" is a little more soft and polite. The speaker openly admits that he may not be 100% right about the issue.
Note that I used will in both my example sentences. The part starting with "that" is a content clause, and it can assume any tense, because its tense does not depend on would:
The word whose tense directly depends on "would" is "argue". It can assume only the Present Simple form: