Question

Define Past Future perfect Tense
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Answer 1

It is used to express the ‘idea’ that in the past an action/event was predicted, planned, promised, expected or obliged to be done in the future of past, doesn’t matter if the idea is correct or not.

Since the future of past meant by the ‘idea’ is actually future in perspective of past which can actually become past, present or future related to perspective of
present, therefore we can use this tense for the function of Past-Simple Tense, Present-Simple Tense or Future-Simple Tense.

* When the expression is added by conditional If-Clause, it becomes a Conjunction Statement which will be discussed in other chapter of this tutorial.
* Time adverbs which can be used: {all Time Adverbs for Past, Present or Future.}
* All kinds of verbs can be used.

FORMULA AND EXAMPLES:

Positive:
(I) Subject + [should/would] + verb-inf + {adverbs}
(A) Subject + [should/would] + verb-inf + {objects/adverbs}
(P) Subject + [should/would] + be + verb-pp + {by objects/adverbs}
(I) It should be OK now. (Present-Simple) (Obligation)
(I) If you invited me, I would come to your party. (Past-Simple) (Plan)
(A) I should pick him up at station yesterday evening. (Past-Simple) (Obligation)
(A) He said he would buy a house last year. (Past-Simple) (Plan)
(P) It would be discovered soon. (Future-Simple) (Prediction)
(P) If you behaved well, you should be respected. (Past-Simple) (Obligation)

Answer 2

FUNCTION:

It is used to express the ‘idea’ in the past that an action/event was predicted, planned, promised, expected or obliged to have been done completely before/ by a certain time in the future (of past), or before/while another action/event happened in the future of past, regardless the fact that the idea has not been proved to be true.

We can use this tense for the purpose (function) of Past-Perfect Tense, Present-Perfect Tense or Future-Perfect Tense.

* Time adverbs which can be used: {all Time Adverbs for Past, Present or Future.}

* All kinds of verbs can be used.

FORMULA AND EXAMPLES:

Positive:

(I) Subject + [should/would] + have + verb-pp + {adverbs}

(A) Subject + [should/would] + have + verb-pp + {object/adverbs}

(P) Subject + [should/would] + have + been + verb-pp + {by object/adverbs}

(I) You should have started thinking about your future now. (Presen-Perfect ) (Obligation)

(I) I would have got up early when everyone is still sleeping. (Future-Perfect) (Prediction)

(A) You should have finished your breakfast before you left this morning. (Past-Perfect ) (Obligation)

(A) If he had got money, he would have paid his bills last week. (Past-Perfect ) (Plan)

(P) Your old past should have been forgotten now. (Present-Perfect) (Obligation)

(P) The question would have been answered before we leave from office this evening. (Future-Perfect) (Prediction)

Negative:

(I) Subject + [should/would] not + have + verb-pp + {adverbs}

(A) Subject + [should/would] not + have + verb-pp + {object/adverbs}

(P) Subject + [should/would] not + have + been + verb-pp + {by object/adverbs}

(I) She shouldn’t have left before I came to pick her. (Past-Perfect ) (Obligation)

(I) He would have not arrived by 8 o’clock tonight. (Future-Perfect) (Prediction)

(A) We shouldn’t have started the meeting before the manager came. (Past-Perfect ) (Prediction)

(A) I wouldn’t actually have finished my work when we met. (Past-Perfect ) (Plan)

(P) The letter should not have been sent before 7 pm last night. (Past-Perfect ) (Obligation)

(P) The newspaper would not have been thrown out, if you had told me before. (Past-Perfect ) (Plan)

Interrogative:

(I) [Should/Would]{not} + subject + have + verb-pp + {adverbs}

(A) [Should/Would]{not} + subject + have + verb-pp + {object/adverbs}

(P) [Should/Would]{not} + subject + have + been + verb-pp + {by object/adverbs}

(I) Should you have waited that long until you took a decision? (Past-Perfect ) (Obligation)

(I) Would the party have begun when we arrive tonight? (Future-Perfect) (Prediction)

(A) Should we have solved this problem now? (Present-Perfect) (Obligation)

(A) Would we have prepared the materials before next meeting ? (Future-Perfect) (Prediction)

(P) Should this method have been tested before it was approved? (Past-Perfect ) (Obligation)

(P) Would your money have been finished before you get your next salary? (Future-Perfect) (Prediction)

Expression “Would the party have begun when we arrive tonight?” is Past-Future expression which has the same meaning with Future-Perfect Tense statement “Will the party have begun when we arrive tonight?”.

OTHER EXAMPLES:

You should have asked others opinion before you make a decision.