Use proper words and mind the tense, voice and so on.
运用适当的词并且注意时态，语态等等。
Contrastive studies of words help to master words in their true meanings and to use proper words in proper places.
词汇对比研究有助于人们掌握词义并能恰当准确地利用词汇。
Their words and sentences don't accord with English usage, and they aren't able to use proper words and phrases in situations.
他们用词和造句的方法不符合英语的习惯，不会在适当的语境用合适的词和短语。
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