Question

The following sentence contains _____.

It is not right to make a promise unless one is sure he can fulfill the promise.

one adverb clause

two noun clauses

two adjective clauses

one adverb and one adjective clause

Answer 1

Let's define these types of clauses. Adjective clauses can serve as a multi-word adjective, basically. Noun clauses can serve as a multi-word noun, with a subject and verb, but remember, they are still dependent. Adverb clauses start with a subordinating conjunction. Now let's dissect this sentence.

"It is not right" independent clause
"to make a promise" adjective clause
"unless one is sure he can fulfill the promise" adverb clause

the answer is "one adverb clause and one adjective clause"