Detect contrast, comparison or example in an english sentence

manpreet Best Answer 2 years ago

Is there any tool or technique available in NLP / machine learning so that I can easily detect presence of contrast, comparison or example in an English sentence? For example, lets consider the following sentences:

1. Students often cram at the last minute; however, spaced study proves more effective.

2. Many atolls can be found in the Pacific Ocean; similarly, other coral islands are found in the Caribbean Sea.

3. Unguents, such as first aid cream, Cortaid, Vick-Salve, and Deep heat, are found in most homes.

Sentence 1 shows contrast to the word "cram" with "spaced study" with the use of the word "however".

Sentence 2 is showing comparison - "atolls" followed by "similarly", then "coral islands".

Sentence 3 is giving examples of "Unguents" followed by "such as" and the related example words.

I need to detect presence of such contrast, comparison and example in a sentence for the specified keyword. In our "case", "cram", "atolls" and unguents are the keywords.