How do I use COD and COI in French? I need to know how and where I need to add the le/la/l' in sentences. Also where I need to add lui/leur ? What are the things I need to understand to use them?​

Le is used for a masculine word, La is used for a feminine word, and L' is used in a situation where the first letter of the next word is a vowel. (eg. "the education" ; "l'éducation"). Sorry, Im not sure about COD and COI </3

Lui is used for a singular person, and Leur is for plural. They're used for indirect responses and are used after "à"

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your doing it right

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this commercial passage is a real success. all the shops are great! there is a small biocoop to out with bio from quality, a well-known pastry chef, a wine seller, an italian brasserie offering midday meals on a superb terrace where the dishes are plentiful, the food is quality, the ice creams are made by the owner early in the morning and a very nice bookstore located in a pleasant setting and out of time. the highlights are relevant and well presented, we feel a real expertise on the part of booksellers and not just a desire to sell. lesrayons are filled with beautiful things for young and old. and very lively. you wouldn't think you were in strasbourg. an ideal place to spend delicious moments around a good coffee, a typical italian dish, a trendy pastry shop while reading a good book bought in the bookstore.