By reading! :D Good writers are great readers.

Steps: 1. read a text, remember it and try to write the same text on the textbook. 2. read a different text, remember it and try to write the same text on the textbook. ... between these steps chat with English native speakers on-line.

Try to write a diary in English. Balance that with reading a lot--magazines, novels, anything. In English. If you want to be able to write, you have to be able to read, first. Build up your mental vocabularies and such. It'll grow.

more details，please.Thanks a lot

write more, post to notebook, read feedback corrections