Adding Commas to an Introductory Clause - Add a Comma to the Sentence to Separate the Introductory Clause

Sep 30, 2026

English language exercise focused on inserting commas after introductory clauses within sentences. Fifteen short science, nature, and classroom scenarios are presented first without commas, then revised versions show correct punctuation placement. Topics include space travel, Arctic fox camouflage, volcanic lava forming obsidian, swimming meet results, global spider distribution, aviation history, animal tracks, plant time-lapse growth, rainforest oxygen, printing press copying, and more. Aimed at improving sentence structure and clarity.

LanguageEnglish

CategoryExam

FormatPDF

Pages3

Reading Time8 min

AccessFree to download

Introductory Clause Comma Practice

Sentence Corrections (1-15)

Add a comma to the sentence to seperate the introductory clause. 1) After the rocket launched from the space center in Florida it reached outer space in less than ten minutes. 2) When an arctic fox senses danger in the frozen tundra its white fur helps it blend perfectly into the snow. 3) Because lava from a volcano cools very quickly in water it can form a shiny black rock called obsidian. 4) During the swim meet at the community pool last Saturday Carlos beat his personal best time in the butterfly stroke. 5) With over forty thousand known species around the globe spiders are found on every continent except Antarctica. 6) Since the Wright brothers flew their first airplane in 1903 aviation technology has advanced at an incredible pace. 7) After the park ranger showed us how to identify animal tracks we followed a set of deer prints down to the creek. 8) While watching the time-lapse video of a plant growing the class was amazed at how fast the stem reached upward. 9) Because the Amazon rainforest produces so much oxygen many scientists refer to it as the lungs of the planet. 10) Before the invention of the printing press every single book had to be copied by hand one page at a time. 11) When a praying mantis spots its prey on a nearby leaf it strikes with lightning speed using its powerful front legs. 12) At the outdoor rock climbing wall during summer camp Emma reached the very top on her first attempt. 13) After the science teacher dropped a Mentos candy into diet soda a huge fountain of fizz shot several feet into the air. 14) Because the Sahara Desert gets so hot during the day temperatures there can reach over one hundred and thirty degrees. 15) During the class trip to the planetarium we learned that some stars are actually bigger than our entire sun. |
Language Arts | [www.CommonCoreSheets.com](www.CommonCoreSheets.com) | 5 | 1-10
11-15 | 93 | 87 | 80 | 73 | 67 | 60 | 53 | 47 | 40 | 33 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | 27 | 20 | 13 | 7 | 0 | | | | | | Add a comma to the sentence to seperate the introductory clause. 1) After the rocket launched from the space center in Florida, it reached outer space in less than ten minutes. 2) When an arctic fox senses danger in the frozen tundra, its white fur helps it blend perfectly into the snow. 3) Because lava from a volcano cools very quickly in water, it can form a shiny black rock called obsidian. 4) During the swim meet at the community pool last Saturday, Carlos beat his personal best time in the butterfly stroke. 5) With over forty thousand known species around the globe, spiders are found on every continent except Antarctica. 6) Since the Wright brothers flew their first airplane in 1903, aviation technology has advanced at an incredible pace. 7) After the park ranger showed us how to identify animal tracks, we followed a set of deer prints down to the creek. 8) While watching the time-lapse video of a plant growing, the class was amazed at how fast the stem reached upward. 9) Because the Amazon rainforest produces so much oxygen, many scientists refer to it as the lungs of the planet. 10) Before the invention of the printing press, every single book had to be copied by hand one page at a time. 11) When a praying mantis spots its prey on a nearby leaf, it strikes with lightning speed using its powerful front legs. 12) At the outdoor rock climbing wall during summer camp, Emma reached the very top on her first attempt. 13) After the science teacher dropped a Mentos candy into diet soda, a huge fountain of fizz shot several feet into the air. 14) Because the Sahara Desert gets so hot during the day, temperatures there can reach over one hundred and thirty degrees. 15) During the class trip to the planetarium, we learned that some stars are actually bigger than our entire sun. |
Language Arts | [www.CommonCoreSheets.com](www.

FAQs

What is the main skill practiced in this document?

Adding commas to separate introductory clauses from the main part of a sentence.

How many sentences are included in the practice set?

There are 15 sentences in the list.

What types of sentences are used as examples?

Examples come from everyday and educational contexts, including science facts, animals, school activities, and technology history.

Sep 30, 2026

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