you should certainly be on your guard against thieves.be on your guard本身就是戒备防备的意思,为什么还要用agains他也是,防备;预防的意思

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you should certainly be on your guard against thieves.be on your guard本身就是戒备防备的意思,为什么还要用agains他也是,防备;预防的意思
you should certainly be on your guard against thieves.be on your guard本身就是戒备防备的意思,
为什么还要用agains他也是,防备;预防的意思

you should certainly be on your guard against thieves.be on your guard本身就是戒备防备的意思,为什么还要用agains他也是,防备;预防的意思
you should certainly be on your guard 不能直接跟宾语.必须加against意思是防备
附against意义：介词 prep.
1.反对;违反
The fight against inflation has been going on for almost two years.
抑制通货膨胀的战斗已展开近两年了.2.逆;对着
They sounded a sharp warning against all these tendencies.
对于这种种倾向,他们发出了严厉的警告.3.倚;靠
His desk is against the wall.
他的办公桌靠墙放着.4.以...为背景
The little red house looks so beautiful against the green woods.
那座红色的小屋在翠绿的森林衬托下显得很美.5.防备;预防
We bought some warm clothes against the coming winter.
我们添置了一些御寒的衣服以迎接即将来临的冬季.6.不利于
She has said nothing against you.
她并没有说任何对你不利的话.

对，be on one's guard, 就是“警惕，提防”的意思，但“警惕，提防"什么人时，后面要与against 搭配。
you should certainly be on your guard 意思是“你必须小心行事”。
而you should certainly be on your guard against thieves意思是“你务必要提防小偷”，两个句子的含义...

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用作介词，大意等同于versus

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You certainly should not go to that party tonight什么意思 Certainly ,( ) ( ) with you? certainly.here you are You must certainly be happy Certainly certainly certainly certainly Certainly we should look at the scenery very carefully Darling,I will certainly give you happiness yes of course sure certainly you bet You should you should -Would you mind helping me?-Certainly还是Certainly not.表示当然不介意-Would you mind helping me?-Certainly还是Certainly not.表示“当然不介意” should you 还是 you should Are you the dog?Such bitch likes certainly you 为什么是are you certain 不是are you certainly you will certainly be happy这句话对吗?certainly修饰那个词?