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It might help if you try always to look for an active verb, and an active way of phrasing your statements. "Be" verbs (is, are) lie flat and motionless. "The problem with this approach is that......
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Source: https://writers.stackexchange.com/a/37748 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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It might help if you try always to look for an active verb, and an active way of phrasing your statements. "Be" verbs (is, are) lie flat and motionless. "The problem with this approach is that...." is a weak way to start identifying a problem. Instead, try an active verb -- don't just say 'this is a problem" but "this thing does something (which is obviously a problem)." "The approach (fails, misses, lacks, hurts, ignores, minimizes)" and so on. As mentioned by others, also, the use of "is that" is awkward (ungrammatical?) in your example. "The other feature that has been neglected is [X feature]..." NOT "The other feature that has been neglected is that [there is a feature named X] In other words, basic recasting of your sentences can eliminate "is that" in most cases.