1) I intended to have spent my summer vacation in the country
2) I knew him to be waiting for me that evening -
    I would rather say "I knew he was waiting for me that evening)

3) We are to meet at the station at six oclock
4) He is known to have been doing a lot to improve his knowledge of English
5) To read is useful - I would rather say "reading is beautiful"
6) I saw him enter the room - I would rather say "I saw him entering the room"
7) I felt him to be an honest man
8) Have you ever heard him complain of difficulty?

So, I have taken these sentences from a grammar book. However, some of them sound weird to me. My question is are these sentences too formal? How come I have never come across this kind of grammar usage.

  • Welcome to ELL.SE. As this is a Q&A site and not a discussion forum, it is usually better to ask one question at a time, explaining why you are confused about a certain point of grammar or usage. For what it's worth, all of these sentences are grammatically correct, but not everyone would use them in conversation. – choster Jan 6 '17 at 5:20

Some of your answers are wrong, and also some examples provided by the book are also wrong.

Here is how I'd rewrite the wrong ones:

He is known for having been doing a lot to improve his knowledge of English

To read/Reading is useful (Beautiful is absolutely different from useful)

I saw him enter the room/entering (Both mean the same thing)

I considered him to be an honest man.

  • None of the examples are "wrong," in the absence of other context, but it is true they are not necessarily idiomatic, especially in conversational English. – choster Jan 6 '17 at 5:21

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