I often pick up some new words while reading. But I easily forget them. How can I remember them clearly?
Remember, there are two kinds of vocabulary: receptive and productive. Receptive vocabulary refers to the words you can recognize and understand but can’t necessarily use. Productive vocabulary refers to the words you know and can use with confidence. Your receptive vocabulary is always far larger than your productive vocabulary. This refers to your command of your native language, as well as to English. So when you say you can’t remember new words easily, this doesn’t matter. They may have entered your receptive command. In other words, when you encounter them again you will recognize and understand them, but you might not know how to use them. This means you don’t have to try to remember every new word you encounter. One way words cross from our receptive vocabulary to our productive use is through sufficient exposure to the word in a wide variety of contexts. Reading as much as you can will help you to consolidate what you know and increase your vocabulary. But a new lexical item only becomes ‘entirely yours’ when you know how to use it. Using words in speech and in writing will enable you to develop your productive command of English.