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[sitifan]

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Source: https://www.facebook.com/1000637662...u-are-a-member-invite-someo/1807201616011042/

Why not use "yet" in a negative clause as the sentence below?
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[SoothingDave]

You could. Either expresses the idea.

 

[sitifan]

1. How can you be sure that I haven't already done my homework?
2. How can you be sure that I haven't done my homework yet?
What's the difference in meaning between the above two sentences?

 

[emsr2d2]

None.

 

[jutfrank]

1. How can you be sure that I haven't already done my homework?
2. How can you be sure that I haven't done my homework yet?
What's the difference in meaning between the above two sentences?

It's not a difference in meaning in the way you're thinking. The difference lies in how and why the questions could be used.

 

[sitifan]

It's not a difference in meaning in the way you're thinking. The difference lies in how and why the questions could be used.

(Quoted from Gemini)​

In short: Sentence 1 argues that the homework might be done. Sentence 2 accepts that the homework is not done, but asks how the listener knew.

Moderator note: Restored deleted post since it was quoted and still relevant to conversation. Please don't delete messages once they're quoted and being discussed.

 

[SoothingDave]

As I said, either expresses the idea.

(Quoted from Gemini)​

In short: Sentence 1 argues that the homework might be done. Sentence 2 accepts that the homework is not done, but asks how the listener knew.

Nonsense. Both are asking the same thing "how can you be sure?" The phrasing of the rest is two ways of saying the same thing.

 

[5jj]

Don't trust Gemini.

 

[sitifan]

As I said, either expresses the idea.
Nonsense. Both are asking the same thing "how can you be sure?" The phrasing of the rest is two ways of saying the same thing.

Do the sentences below mean the same thing?
3. I haven't already finished my homework.
4. I haven't finished my homework yet.

 

[5jj]

3. is not natural.

 

[sitifan]

3. I haven't already finished my homework.
3. is not natural.

But 1 is natural, isn't it?
1. How can you be sure that I haven't already done my homework?

 

[5jj]

It's OK.

 

[jutfrank]

(Quoted from Gemini)​

In short: Sentence 1 argues that the homework might be done. Sentence 2 accepts that the homework is not done, but asks how the listener knew.

Why are you telling us what Gemini says? Do you want us to rate the answer? You sometimes quote AI in your threads and it's sometimes not clear to me what you mean by doing so.

 

[sitifan]

It's not a difference in meaning in the way you're thinking. The difference lies in how and why the questions could be used.

Could you tell me the difference in how and why the questions could be used?
1. How can you be sure that I haven't already done my homework?
2. How can you be sure that I haven't done my homework yet?

 

[jutfrank]

This is just one way out of many that I could imagine your artificial sentences being used:

Parent: Do your homework.
Child: How can you be sure that I haven’t already done my homework?

I mean for the stress here to be on 'done', with a rising intonation. This is because the focus is on the completion of the task. It's a bit odd perhaps that the child repeats 'my homework' instead of saying 'it' but that's a separate point. The child is challenging the parent's assumption.

Parent: You still haven’t done your homework yet.
Child: How can you be sure that I haven’t done my homework yet?

In this case, the child is challenging the knowledge by repeating the parent's phrasing. The parent uses 'still' and 'not yet' to focus on the present moment in time. The child's response stresses the word 'sure', since the parent is making an assertion.

I've used minimal context here, for the sake of simplicity.