This is a general perception of learners that we need to know all the rules of Grammar before we start speaking. But that is not true at all. In fact we start speaking our mother tongue at an early age even without getting a formal education of Grammar. The same rule stands valid in case of learning a Foreign language like English. We need to know the expressions for communicative English. We can start with short and simple expressions. Thanks, Sorry, yes, Excuse me etc. are the expressions of Spoken English. The first thing that we need to do is to learn expressions for everyday communication and then breaking hitch we need to use those expressions in right situations. This practice will certainly improve the level of our confidence.