There are different kinds of adverbs. Adverbs of manner show the manner in which an action is performed. Adverbs of time and place show the time and place of an action. There are several other kinds of adverbs of too.
In the same way, there are several different kinds of adverb clauses.
A simple sentence can be converted into a complex sentence by expanding an adverb or another word into an adverb clause.
Note that an adverb clause can express several different ideas. For example, it can show time, reason, purpose and consequence. It can also be used to state a condition or make a comparison.
How to make a complex sentence with an adverb clause?
If the original sentence contains an idea related to time, we can convert it into a complex sentence using an adverb clause of time. Chief conjunctions used to introduce adverb clauses of time are: before, after, when, while, as, since, till etc.
Think before leaping. (Simple sentence)
It can be converted into a complex sentence by changing the adverb phrase before leaping into an adverb clause.
Think before you leap.
I will not forget this experience till my death.
Change the phrase ’till my death’ into the adverb clause of time ’till I die’.
I will not forget this experience till I die.
If the original sentence contains an idea related to place, we can convert it into a complex sentence using an adverb clause of place.
You may go anywhere.
Change the adverb anywhere into the adverb clause ‘wherever you like’.
You may go wherever you like.
We eat to live. (Simple sentence)
We eat so that we may live. (Complex sentence with adverb clause of purpose)