Introducing introductory clauses
Introductory clauses are phrases at the beginning of sentences which are set off from the rest of the sentence with a comma. Introductory clauses often begin with a preposition (in, of, after, about ....) and do not form a complete sentence on their own. In these worksheets, identify introductory clauses and add commas to set them off from the rest of the sentence.
Source: k5learning
