Can I put infinitive in the end of the sentence?

[Thomas0857]

She was sorry she had got no knife to cut.
(Can I put infinitive in the end of the sentence?)

You need not answer the question in a complete sentence. (correct)
You are(v) not necessary(n) to answer(inf.) the question in a complete sentence. (incorrect, why?)

Robert is said to have studied abroad, but I don't know what country he studies in. (correct)
Robert is said to study abroad, but I don't know what country he studies in.
(incorrect, why? where expose the action in past?)


Thanks

[Rusty]

She was sorry she had got no knife to cut.
(Can I put infinitive in the end of the sentence?)

You need not answer the question in a complete sentence. (correct)
You are(v) not necessary(n) to answer(inf.) the question in a complete sentence. (incorrect, why?)

Robert is said to have studied abroad, but I don't know what country he studies in. (correct)
Robert is said to study abroad, but I don't know what country he studies in.
(incorrect, why? where expose the action in past?)


Thanks
She was sorry she had got no knife to cut.
(Can I put infinitive in the end of the sentence?)
(An infinitive at the end of a sentence is all right.
She had no book to read.
He had no place to go.
Your sentence has problems. It could mean she had no knife to cut with (with which to cut something), or she had no knife to be cut. Example: She had no cake to cut).

You need not answer the question in a complete sentence. (correct)
You are(v) not necessary(n) to answer(inf.) the question in a complete sentence. (incorrect, why?)
(The idiom is: It is not necessary that you answer the question.....)

1. Robert is said to have studied abroad, but I don't know what country he studies in. (correct)
2. Robert is said to study abroad, but I don't know what country he studies in.
(incorrect, why? where expose the action in past?)
(Here is my opinion:
1. Robert is said to have studied abroad, but I don't know what country he studied in.
2. Robert is said to study abroad, but I don't know what country he studies in.
3. Robert is said to be studying abroad, but I don't know what country he is studying in).

[danmahaffey]

She was sorry she had got no knife to cut.
(Can I put infinitive in the end of the sentence?)
This sentence is better this way:
She was sorry she had got no knife to cut with.

This is more formal/more correct:
She was sorry she had no knife with which to cut.

You can see the infinitive at the very end of the sentence, and this is perfectly OK.


You need not answer the question in a complete sentence. (correct)
You are(v) not necessary(n) to answer(inf.) the question in a complete sentence. (incorrect, why?)
You need not answer... = You do not need to answer...

You are not necessary... = You are unnecessary; you don't need to be here... (but you are necessary, aren't you?)

The sentence above works better this way: It is not necessary...

See my answer to your Gerund and Infinitive question from earlier today: http://www.englishpage.com/forums/showthread.php?p=17500#post17500


Robert is said to have studied abroad, but I don't know what country he studies in. (correct)
Robert is said to study abroad, but I don't know what country he studies in.
(incorrect, why? where expose the action in past?)

Robert is said to have studied abroad, but I don't know what country he studies in would be correct if you wrote studied:
Robert is said to have studied abroad, but I don't know what country he studied in.

Robert is said to study abroad, but I don't know what country he studies in is actually correct. Of course, as you asked, where is the action in the past? It's not here in this sentence. It is in the first sentence correctly.

Let me know if my answers are what you are looking for.

Good luck.

Note to Rusty: I didn't see your answer before I wrote mine. Looks like we're saying the same thing. That's good, isn't it?