| 词组 | essential |
| 释义 | 1．注意下面各句里用 should 或虚拟现在式： It is essential that the change should be made. It is essential that the change be（不用is）made. It was essential that the change should be made. It was essential that the change be（不用was）made. |
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英语用法大全包含3532条英语用法指南，基本涵盖了全部常用英文词汇及语法点的翻译及用法，是英语学习的有利工具。