• Is the comma used in the below sentence necessary?

  • Is it okay to use different forms or parts of speech for juxtaposed elements?

    I.g. In the below sentence, a noun "development" and gerunds "reducing and lowering" are juxtaposed.

Engineers should contribute to increase of revenues by proactive development of good products, and reducing and lowering cost in each step of their development cycle.

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    The comma is fine there. In this case, taking it out is ok as well - though that would somewhat reduce clarity. Reducing and lowering function as verbs there, not nouns, so they're not gerunds. The sentence as a whole looks ok. – Lawrence Aug 4 '18 at 8:49
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    Using different verb forms in the two parts of the sentence certainly makes it awkward, but it's not necessarily wrong. (As it's written, you're either missing an article before increase or suffering from an extraneous of in front of revenues, and missing an article in front of proactive. Also, cost and cycle should be plural.) – Jason Bassford Aug 4 '18 at 9:36
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    I'm unclear on the difference between reducing and lowering the cost. – S Conroy Aug 5 '18 at 0:55
  • So am I, and I'm sorry to say I suggest the example does more to identify you as a non-native speaker than to help with anything related to engineering, costing or development. – Robbie Goodwin Aug 6 '18 at 17:23

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