Words and Phrases
知识要点1 essential adj.极其重要的，必不可少的
(教材P5) Which sentences contain a clause with essential information and which with extra information？哪些句子包含必不可少的信息，哪些句子包含附加信息？
[例] What essential piece of clothing would you take?
你会带哪件必不可少的衣服呢？
[知识拓展]
(1)be essential for/to... 对……来说是必要的
It is essential that...(should) do... 做……是必要的
It is essential (for sb.) to do sth. (某人)做某事是必要的
(2)essentially adv. 本质上，根本上
[即学即练] 单句语法填空/句型转换
①She added a few characters and changed some names，but essentially (essential) this is a true story.
②It is essential that students (should) get (get) themselves prepared for the coming future.
③The mental and physical development of children needs a healthy environment.
→A healthy environment is essential for/to the mental and physical development of children.(essential)
