learning english is just the same as we learn chinese,when we are reading chinese composition we usually write down the good word in the passage,same to english,you can write down the good words that you see when you are reading english story books.
And you also need to memorise the words that you write down,and try to use it when you are writing a composition.
you can also go to bbc website to learn english...
read more idoms,it will help you in your composition.