Now that you've considered the suffix/prefix en, you may realize that you still can't recall their meanings or think of ways to use them spontaneously. Below is an example of a dialog using several of the expressions from the previous posting. Whenever you read or watch TV, pay attention and watch out for words that you've been studying. Hearing the words or seeing them again in print in another context will reinforce the vocabulary and give you confidence to use them in your daily speech or writing.
John: 'Lighten up! You're too serious. You need to enjoy your life each day. Studying English isn't just about strengthening your vocabulary. It's also about broadening/widening your horizons.'
Maria: 'But I want to enlarge my vocabulary and sharpen my skills in writing and speaking. I wish I could lengthen the day so that there were more hours for me to practice and review what I learn. It really brightens my day when I hear or find a way to use a new idiom or expression.'
John: 'Yeah, I know what you mean. However, you can deepen your knowledge of the language by using it in the 'real' world, too - not just doing exercises. If you're a shy person, you can keep a diary or journal and write in it every day, trying to use new expressions and think in English.'
Maria: 'You're right, John. Sometimes my determination is weakened by a feeling of overwhelming anxiety as I realize there is still so much vocabulary that I don't understand or know how to use. But I'm going to start writing in English to myself every day and ask my teacher to tell me if I'm using expressions correctly....'