Although they were present, they said nothing. Here 'Although they were present', this clause is /an-

• Although they were present, they said nothing.
- Here 'Although they were present', this clause is an- Adverbial Clause.

• যে subordinate clause বাক্যে একটি adverb হিসেবে কাজ করে এবং একটি verb বা একটি adjective-clause বা অন্য একটি adverb clause-কে modify করে তাকে Adverb Clause বলে।
• "Although they were present" is an adverbial clause because it provides information about the circumstances under which the main clause "they said nothing" occurred.