r - find out word frequency in a table according to a list -

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now have dtm, turn dtm frequency table

freqs <- as.data.frame(inspect(dtm1))

here's how freqs looks like, contains 1 row shows frequency of these words in document

i      hate   school   how   can    hi 4      5        3       2      3     1    4    5   1

i have list 

list <- c("hi", "how", "are", "you")

how can find out frequency of words in frequency table according list, compile these word frequencies in table

hi  how   1    3    4   5

if words variable names in data.frame

> freqs[,list]   hi how 1  1   3   4   5

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