How to write in international English?

International its word formation inter (entry, mutual)-+nation (country)+-al (adjective suffix). Some dictionaries contain word formation information, so we must learn English through root affixes and word formation. Middle school English-Chinese dual-solution multifunctional learning dictionary provides very practical information of root affixes. You can also refer to this article "A Complete Collection of Memorizing Methods of English Words (Pronunciation of Roots and Affixes with Rich Examples)".