"집중하십시오."

Translation: Please focus.

[iambilkei]

thanks duo really needed the reminder

[Lumtul]

So... 십시오 means please, rigth?

[josueetcom]

No, it's just the formally polite way to give an order. To formally say "please" you would say 주십시오

[hyunsjin]

yes, when you're giving an order

[minhoeshoe]

Focus on me

[angelstar.S2]

集中

[7hnM6]

I wish Duolingo included those in the lessons

[gauri_raut]

I know this because one ARMY told Jimin to focus on colouring instead of looking at the comments

[Andrew-Lin]

May I say "Be concentrated." ?

[The_Micah]

No. In English "I concentrate" means to focus attention on something. The verb is used like that for people: I concentrate, you concentrate, etc... In reference to an inanimate object, "to be concentrated" is a technical term for a high percentage of something within a representative mass - usually for chemicals - "This is a concentrated salt water solution." or like that.

[Jess76231]

yeah, but if I said my brother has been really concentrated on his studies lately, it could be used in that manner. also technically it does not have to be a high percentage, in chem we often talk about things in really low concentrations. (ex: this sodium chloride solution is concentrated at 0.00001M)

[The_Micah]

You're right about the chemistry bit, I'm sorry :-)

The usage of concentrate you suggested is a phrasal verb though, which is more complicated. I understood that Andrew-Lim was asking about the imperative mode - to instruct someone to concentrate on something - like I assume 집중하십시오 does in this lesson. In English, you would not say, "be concentrated" or "concentrate you", although someone could "be concentrated on" something. Hope that is more clear!