At first, I thought it was a good idea to teach idioms ,but then I realized how hard it is for my students to understand and use them correctly. So for awhile, I stopped teaching idioms. Students who returned from America and Britain told me how often native English speakers used idioms on a daily basis, as well as how many phrasal verbs they used in their everyday speech, which were difficult for them to understand. You may observe how frequently they are used by watching English-language movies or TV shows. The English language has about 5000 phrasal verbs. Phrasal verbs are thought to be the distinguishing factor between non-native and native speakers. It's not necessary to learn them all, but having a good understanding of the common ones is very helpful and will help you on your way to comprehending and sounding more like a native speaker. A good way to learn idioms is by theme : There are many themes , here are just a few. Actions and behaviour. Add fuel to the fire. If you ad