1. Relative clauses: clauses beginning with who, whose, whom, that, which, whosoever, whomever, whichever, nevertheless – check their use in the question.
Antecedents (the nouns substituted by the pronouns) which, who, he, they, it etc should be clearly matched with their pronouns.
Scientists have observed large quantities of fossil fuel in the Cauvery basin, which are consistent with the growth of mining activities in the area. (which is ambiguously placed)
Scientists have observed large quantities of fossil fuel in the Cauvery basin, an observation consistent with the growth of mining activities in the area.
Wordy: Everybody likes apple pie, which for years has been a favorite American dessert.
Concise: Everybody likes apple pie, for years a favorite American dessert.
In most instances, a relative pronoun is unwanted.
Verb Tense
Incorrect: In the last ten years, dropout rate among minority primary school students fell drastically, while the number of minority students more than doubled.
Correct: In the last ten years, dropout rate among minority primary school students has fallen drastically, while the number of minority students has more than doubled.
Logical Equivalents
1. The study noted that, up to the present, interferon has been more impressive in preventing viral infections as to treat it.
2. The study noted that, up to the present, interferon has been more impressive in preventing viral infections than in treating them.
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