有关动词warn的句型与搭配
I warned him about those stairs. 我警告过他要注意（留意）那些楼梯。
[1]about,注意,相关知识点要注意be about to 是"将要"的意思，含有将来时之意，不要与表示过去时的时间状语连用。另外，be about to 一般用作书面语，对应的口语是be going to.［误］ This class is about to begin just now.［正］ This class is about to begin.［析］ 要注意be about to 是"将要"的意
注意，warn习惯上能后接双宾语，即不用于warn sb sth结构，可考虑改用warn sb of sth。如：
我们警告过他有危险。
误：We warned him the danger.
正：We warned him of the danger.
[2]danger单词记忆法◆记忆方法一：谐音：担架 担架上的病人很危险。◆记忆方法二：分析：dang --- ―挡‖的拼音 er --- ―儿‖的拼音 记忆方法：危险来的时候，母亲总是会挡在儿子前面。◆记忆方法三：分析： dang --- ―挡‖的拼音； er——―儿‖的拼音 记忆方法：危险来的时候，母亲总是会挡在儿子前面。◆记忆方法四：联想方式：dang（荡）；
5. warn只用作动词，不用作名词，其相应的名词是 warning。如：
They have been given a warning. 他们受到警告。
[3]have been,have,相关知识点 have been to / have been in / have gone toⅠ. have been to … 表示：“曾经到过某处”但目前人未在那儿。如：① Where have you been? 你到哪儿去了？（现在已回来）I have been to Beijing. 我去北京了。（现不在北京）② I have never been there before,
He would go in spite of our warning. 尽管我们提出警告他还是要去。
warn相关单词意思与记忆法：
warn单词意思解释释义：
vt. 警告, 提醒, 通知vi. 发出警告【法】 警告, 警戒, 预告相关词组: warn sb of
warn单词相关例句：
This expression refers to encounters between ships of hostile nations. One ship might fire a shot at another， not in order to hit it， but to warn it to move. 这个表达源于敌对国船只在海上相遇时，一方可能向另一方鸣炮，不是为了击中目标，而是警告其快速离开。
This expression refers to encounters between ships of hostile nations. One ship might fire a shot at another, not in order to hit it, but to warn it to move. 这个表达源于敌对国船只在海上相遇时，一方可能向另一方鸣炮，不是为了击中目标，而是警告其快速离开。
Often did we warn them not to do so. 我们曾多次警告过他们，不要这样做。
This expression refers to encounters between ships of hostile nations. One ship might fire a shot at another, not in order to hit it, but to warn it to move. 这个表达源于敌对国船只在海上相遇时，一方可能向另一方鸣炮，不是为了击中目标，而是警告其快速离开。
Often did we warn him not to do so. 我曾常常警告他不要那样做。
We'll go swimming if we get warn enough weather. 如果天气够暖和的话，我们就去游泳。
One ship might fire a shot at another, not in order to hit it, but to warn it to move. 一只船可能向另一方鸣炮，不是为了击中目标，而是警告其快离开。
I warn you that you will fail in the coming exams if you are still so lazy.
Often did we warn them not to do so.
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