Knowing words does not let you speak. You can speak when you have someone to interact with; imagining their feelings is what enables you to speak.
Words are not exchanged like a machine but always with imagination. Since you can imagine what others say, you can respond to them instantly. When learning English, it is critical to practice imagining others’ feelings and understanding their attitudes rather than acquiring knowledge of English.
Believe it or not, this way of practicing works better when you’re alone. You can gain knowledge later. The best way to learn English is to act as if the words are yours: you improve a lot by becoming the actor of your vocalized phrases in English.
The act of asking others a question is another powerful way to learn. It helps you reflect on yourself and develop your imagination.