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4) A dog can be dangerous to you 狗可能给人带来危急。(有这种可能性)
This dog is very clever. It may (或might/could) help you find your key.
这条狗特别聪慧，他可能会帮助你找到钥匙。指详细的事有可能发生。
高三英语语法学问点2
一、非谓语动词
“非谓语动词”可分为动词不定式、：除了不作谓语外,它可以充当主语、宾语、表语、定语、状语与复合宾语(主语补语或宾语补语).：一感(feel).二听(hear,listen to),三让(have,1et, make),四看(see,watCh,notice,observe).再加上help somebody(to)do something和美国英语look at somebody do “二让”属特别：get somebody to do something 与keep somebody (the -ing form)：Papa C makes ：permit,advise, practise,avoid,consider,mind, allow,keep,enjoy,suggest, finish,risk,imagine,escape,need,delay,stand(忍受). 为了简单记住,也可以编成顺口溜：“允许完成练习,建议避开冒险,考虑延期逃跑,喜爱保持想象,须要反对忍受”.其相对应的动词依次是：permit/allow,finish,practise;
advise/suggest, avoid,risk： consider, delay, escape/miss; enjoy/appreciate, keep, imagine; need/want/require,mind. cant help/can’t stand.
二、复合句
1、学生最简单混淆的是定语从句与同位语从句的区分.
例如：A、The news that our team has won the match is true. (同位语从句)
B、The news that he told us surprised everybody here. (定语从句)
关键的区分在于连接或关系代词that：有意义的是定语, 宾语,而引导同位语从句的that只起到连接词的作用.
2、接着简单混淆的是引导定语从句的关系代词that与 which：that之前是不定(代词)、序数(词)、(形容词)级：which之前是介词短语与逗号(非限制性).
例如：A、All that we have to do is to practise every day.
B、The first lesson that I learned will never be forgotten.
C、I have lost my pen,which I like very much.
D、The house in front of which there is a garden is my home.