An adverb clause is a subordinate clause that functions as an adverb. It modifies a verb, an adjective, or adverb. The adverb itself is a word which qualifies a verb or adjective or a pronoun.
When the last guest left the party, we started dancing.
If I make a promise, I won't break it.
Here, when the last guest left the party and if I make a promise are adverb clauses.
|Place||Where?||Wherever there are calculators, there is Casio.|
|Time||When?||After the fruit is ripe, it is sold at the market.|
|Cause||Why? (What caused this?)||I didn't call her because I'm busy.|
|Purpose||Why? (What was the reason for doing this?)||She took a painting course so that she could get some money.|
|Concession||Why is this unexpected?||Although Jary has a Master's degree, he works as a peon.|
|Condition||Under what conditions?||If you save your money, you will be able to go to Goa and Thailand.|