Idon't know which one of these phrases are buttet pionts in a letter. Which one isn't in parallel form. Is their a web site to find out.

A. Increase sales support staff
B. Don't forget marketing plan
C.Run market test with Group
D. Decrease overhead
I think it is D but I would like to learn more about this.

It's not D.

Three of these statements are positive, but B. is negative.

These sites should help you with parallel constructions.

http://www.myenglishteacher.net/parallelism.html

http://www.rrcc.edu/writing/gex/4.html

http://grammar.quickanddirtytips.com/false-series-parallel-construction.aspx

To determine which of the phrases is not in parallel form, you need to first understand what parallelism is. Parallelism refers to using a consistent grammatical structure or pattern in a sentence or list of items.

Let's analyze each of the phrases in terms of parallelism:

A. Increase sales support staff - This phrase uses an infinitive verb ("increase") followed by a noun ("sales support staff"). The structure here is consistent, so it follows the parallel form.

B. Don't forget marketing plan - This phrase uses a negative verb construction ("don't forget") followed by a noun ("marketing plan"). Although it is not in the same form as the previous phrase, it still follows a consistent structure and is parallel.

C. Run market test with Group - This phrase starts with a verb ("run"), followed by two nouns ("market test" and "Group"). Although it may seem like it follows the same pattern as the previous phrases, it doesn't use parallelism because it uses two nouns instead of a noun and a separate verb. Therefore, this phrase is not in parallel form.

D. Decrease overhead - This phrase uses a verb ("decrease") followed by a noun ("overhead"). Similar to the previous two phrases, it follows a consistent structure and is parallel.

So, the answer is indeed C - "Run market test with Group" is not in parallel form.

To find out more about parallelism and learn general grammar rules, there are various resources available online. Websites like Grammarly, Purdue Online Writing Lab (OWL), and Writing Center have grammar guides that provide explanations and examples on various grammar principles, including parallelism.