Learn common words and phrases in English. You can do this online by watching grammar videos for English language learners such as those found at the Chalk and Talk website. Pay close attention to how these common words and phrases are put together into sentences.
Learn the basic parts of speech. Among these are nouns, adjectives, adverbs, verbs. These different categories of words are put together in distinct ways in English. For instance, an adjective (which describes something) precedes a noun (a person, place, thing, or idea). The "yellow cat" is not the "cat yellow" in English.
Make a plan to read English articles, books, or other material at least 15 minutes each day. Note how the words are put together in the sentences and any grammatical patterns that you see.
Identify mistakes that you commonly make in your grammar and sentence structure by asking a native English speaker to correct you. Learn common mistakes that speakers of your native language often make when they learn English. For example, "The concept of 'for' and 'since' and its use is difficult to handle for Germans. This is because German only has one word to express periods and points of time," according to the Lexophile website.
Join an online language exchange such as My Language Exchange. You will meet online with someone who speaks English and wants to learn your native language. You can have live chats or exchange emails. Ask questions about English grammatical structure when you meet with your conversation partner and have him correct your grammar when you speak and when you exchange emails.