I am so addled with the principle for along time when I find some sentences which are about v.ing or v.ed that make me to confuse even though i could understand the sentences from conversations or contents but I couldn't know the principle of making the sentences and finally Thank you very much for your assisting in my case. Besite that , my english problems probably are principles of verb clause and adjective clause or compound noun (some nouns that include various word's nouns to make one meaningful such as glass bottle , teather hat ) however I would follow to your channel and sill wait your contents in the chanel. 🙏🙏🙏 gratefully!!