Sb. или чаще Smb. - сокращённая форма неопределённого местоимения somebody, что в переводе означает - кто-то, кто-либо и употребляется с одушевлёнными существительными, не называя их прямо, в то время как неопределённое местоимение Sth. или чаще Smth. - что-то, что-нибудь, указывают на неодушевлённые существительные, так же не называя их прямо. There is somebody in my flat. В моей квартире кто–то есть. There is something in my box. В моей коробке что–то есть.
My granny knits My granny is knitting. My granny has knitted My granny has been knitting for 2 hours. My granny will knit. My granny will have been knitting at this time tomorrow. My granny knitted yesterday. My granny was knitting. My granny had been knitting when I came in. My granny would have been knitting. My granny would knit if she were healthy. The sweater is knitted by my granny. The sweater was knitted by my granny The sweater will be knitted by my granny. The sweater has been knitted by my granny.
They have known each other for ages. She hasn't eaten since three o'clock They have been married since 1972 How long have you had your kitten? I have had it since April 4th He hasn't worked for three months They have been at school since eight o'clock How long has she worked in Paris? She has worked there for two years. How long have you been in this team? I have played for Arsenal since I was a teenager. It hasn't rained for a long time. How long have they known each other? They have known each other for ages.
There is somebody in my flat. В моей квартире кто–то есть.
There is something in my box. В моей коробке что–то есть.