Most effective tip: "Think in English"

One of the most common mistakes that English learners make is, they think in their mother tongue. When they want to say something in English, they think in their mother tongue, translate it to English and then say it in English. The result is a very flawed English sentence. Never do this!

If you want to speak in English fluently you will have to learn to "think" in English. When you are constructing sentences in your mind before saying them, think in English and form them in English in your mind.