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I tried that sentence and three similar ones, and this time GPT-4 caught the ambiguity. The results are here:

https://www.gally.net/temp/202212chatgpt/20230508-syntactic-...

I am especially impressed by its comment about one interpretation of “The woman cleaned her teeth with a knife”: “The woman cleaned her teeth that had a knife in them (highly unlikely, but still a possible interpretation).”

As I noted in another comment, I might need to backtrack on my assessment of its grammatical-explanation ability, as until today I had only done tests using the initial release of ChatGPT, not GPT-4.




Anthropic's Claude[1] and Claude+[2] both failed some of these.

Question:

I am interested in syntactic ambiguity in English. Can any of the following sentences be interpreted in more than one way? Explain why or why not.

The man opened the package with a knife.

The burglar threatened the student with a knife.

The woman cleaned her teeth with a knife.

The child pointed at the teacher with a knife.

Claude's answer:

These sentences can be interpreted in multiple ways:

1. The man opened the package with a knife. Ambiguous: The knife could have been used as a tool to cut tape and open the package, or it could imply the man threatened someone with a knife while opening the package.

2. The burglar threatened the student with a knife. Unambiguous: The implication is clearly that the burglar threatened the student using a knife as a weapon.

3. The woman cleaned her teeth with a knife. Ambiguous: The knife could refer to a toothpick or dental tool, or it could imply an unusual way of brushing teeth.

4. The child pointed at the teacher with a knife. Ambiguous: The knife could have been used to gesture and point, or it could imply the child threatened the teacher with a knife.

In summary, sentences that suggest using a knife as a tool tend to be ambiguous between a literal and figurative interpretation. Sentences that clearly describe a knife being used as a weapon are generally unambiguous. The ambiguity arises from the multiple meanings and uses of the word "with."

Does this explanation make sense? Let me know if you have any other questions!

Claude+'s answer:

Here are my analyses of potential syntactic ambiguity in those sentences:

The man opened the package with a knife. - This sentence is ambiguous. It could mean either that the man used a knife to open the package, or that the package contained a knife inside. The ambiguity arises because "with a knife" could modify either "opened" or "package".

The burglar threatened the student with a knife. - This sentence is unambiguous. The only coherent interpretation is that the burglar used a knife to threaten the student. "With a knife" can only modify "threatened" in this sentence.

The woman cleaned her teeth with a knife. - This sentence is ambiguous. It's unclear whether it means the woman used a knife to clean her teeth, or her teeth contained a knife. Again, "with a knife" could modify either "cleaned" or "teeth".

The child pointed at the teacher with a knife. - This sentence is unambiguous. The only meaning that makes sense is that the child pointed at the teacher while holding a knife. "With a knife" can only modify "pointed at" in this example.

In summary, ambiguity can arise when a prepositional phrase like "with a knife" can logically modify more than one part of the sentence. Context often helps resolve such ambiguities, but in isolation some sentences remain open to multiple interpretations. Let me know if you have any other questions!

[1] - https://poe.com/Claude-instant

[2] - https://poe.com/Claude%2B




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