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Nhật Bình Posted 5 years ago
Grammar

Grammar structure

1. The course is to have included music.

Could you explain to me about the the structure " be to have + past participle"?

2. Therefore, humans need to interfere with the process of extinction not only because they instigate it but also because doing so can bring benefits to them.

Is the sentence above grammatically correct?

  

Top answer

t Bình 1. Could you explain to me about the the structure " be to have + past participle"? It's the past of the 'is to' idiom.

— CalifJim

  • t Bình 1.
  • Could you explain to me about the the structure " be to have + past participle"?
  • It's the past of the 'is to' idiom.
  • ) These are the forms: With present infinitive: am to, is to, are to, was to, were to With past infinitive: am to have, is to have, are to have, was to have, were to have These can all be paraphrased by adding 'going', 'supposed', or 'expected' before 'to'.
  • Thus, "We are to be there at 6 o'clock" means, in effect, something like "We are supposed to be there at 6 o'clock".
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4 Answers
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Nh?t Bình1. The course is to have included music.Could you explain to me about the the structure " be to have + past participle"?

It's the past of the 'is to' idiom. (There is no 'be to' or 'be to have', so that's technically not the correct name of the idiom.)

These are the forms:

With present infinitive: am to, is to, are to, was to, were

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Nh?t Bình

2. Therefore, humans need to interfere with the process of extinction not only because they instigate it but also because doing so can bring benefits to them.

Is the sentence above grammatically correct?

Yes.

CJ

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Nh?t Bình1. The course is to have included music.

That is not good English.

You can say: "The course was to have included music." but it is very very rare. (See CJ's post)

The construct: to + have + past participle is called "the perfect infinitive."

Here is a good resource.

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Nh?t Bình1. The course is to have included music.

Either "The course is to include music.", meaning "It is intended that the course will include music." or "The course was to have included music.", meaning "The course was planned such that it would include music", implying that it does not in fact now include music. "Is to have" garbles the tense.

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