Adverb Clauses
Using adverb clauses (ESL About)
A Guide on How to Use Adverbial Clauses of Time (thoughtco.com)
Explanation and examples
ADVANCED ENGLISH GRAMMAR: ADVERB CLAUSE (advancegrammar.blogspot.com)
Identifying adverb clauses quiz
Adverb Clauses
Using adverb clauses (ESL About)
A Guide on How to Use Adverbial Clauses of Time (thoughtco.com)
Explanation and examples
ADVANCED ENGLISH GRAMMAR: ADVERB CLAUSE (advancegrammar.blogspot.com)
Identifying adverb clauses quiz