Petra Marfo Kostelná

Want to feel more confident speaking English — especially at work? Let’s make English work for you.

Hi, I’m Petra, an experienced and TEFL-certified English teacher with over 10 years of experience teaching English online. I specialise in personalised 1:1 lessons for adults and professionals who want to improve their English in a practical, enjoyable and genuinely useful way.

Over the years, I’ve worked with students from different countries, backgrounds and professional fields, helping them become more confident communicators. My international education, extensive travel and experience working in English-speaking environments have also given me a strong understanding of how English is actually used in real-life situations — not just in textbooks.

My lessons are built around YOU

Whether you want to become more fluent, prepare for an important meeting, improve your Business English or simply stop worrying about making mistakes when you speak, we’ll focus on what you actually need.

For professionals, I can tailor lessons to your specific workplace and industry. We can practise:

• Business English & workplace communication
• Meetings, discussions and negotiations
• Presentations and public speaking
• Emails and professional correspondence
• Networking and small talk
• Job interviews
• Industry-specific and technical vocabulary
• Understanding different accents and ways of speaking
• Speaking more naturally, fluently and confidently
• IELTS and other exam preparation

I particularly enjoy helping professionals who already have a good level of English but feel that their confidence, vocabulary or ability to communicate spontaneously doesn't quite match their knowledge of the language.

For example, if you attend meetings in English but struggle to follow technical discussions, find yourself searching for the right words, or simply don't feel confident speaking up, we can recreate those situations in our lessons and work on exactly what you need.

What can you expect from my lessons?

No one-size-fits-all approach. I adapt every lesson to your level, goals, interests and real-life needs.

I want you to spend as much time as possible using English, rather than simply talking about English. We’ll have meaningful conversations, work with authentic materials, build useful vocabulary and practise situations you are likely to encounter outside the classroom.

Most importantly, I want my lessons to be a place where you feel comfortable making mistakes. You don't need to speak perfect English to communicate effectively — you need the confidence and tools to keep the conversation going.

Whether your goal is to speak more confidently, succeed in an international workplace, prepare for an exam, or simply enjoy communicating in English, I’d love to help you get there.

Tell me what you would like to achieve with your English, and we can build the lessons around you.