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要学好英语，大量的练习是必要的。
[误] To learn English well, a great deal of practice is necessary.
[正] To learn English well, one needs to have a great deal of practice.
注：英语中非谓语动词的逻辑主语要与句子的主语一致，本例句中不定式 to learn English well 的逻辑主语应该是“人”，而句子的主语却是 practice，两者不相一致，违背了英语习惯，所以必须将句子的主语改为 one，并做其它相应的调整。
[误] To learn English well, a great deal of practice is necessary.
[正] To learn English well, one needs to have a great deal of practice.
注：英语中非谓语动词的逻辑主语要与句子的主语一致，本例句中不定式 to learn English well 的逻辑主语应该是“人”，而句子的主语却是 practice，两者不相一致，违背了英语习惯，所以必须将句子的主语改为 one，并做其它相应的调整。
