The situation is very serious. Here 'very' is -

• The situation is very serious. Here 'very' is - Adverb.

• Adverb:
- যেসব word noun বা pronoun ছাড়া অন্য যেকোন parts of speech, বিশেষ করে verb কে modify করে সেগুলোকে adverb বলে।
- Adverb সাধারণত Verb, Adjectiveকিংবা অন্য কোনো Adverbকে modify করে।
- কিন্তু Noun বা Pronoun কে modify করে না।

• Very: [adverb]
English meaning: (used to add emphasis to an adjective or adverb) to a great degree or extremely.
Bangla meaning: অতি; অত্যন্ত; অতিশয়; ভারী; খুব।

• The situation is very serious.
- এই বাক্যে adverb 'very', adjective 'serious.' কে মডিফাই করছে।
- Therefore, "very" functions as an adverb here, emphasizing the degree of seriousness.
- This makes "very" an adverb in this context.