You might be familiar with mangoes. The scientific name of the mango tree is Mangifera indica. Mangos are the most flavorful fruit in the world. They are cultivated in south and southeast Asia. There are more than 75 varieties of mangoes in Bangladesh named Mohanbhog, Rajbhog, Ranibhog, Ranipachanda, Jagatmohini, Himsagor, Fazli, and many more.
I recommend the famous grammar book English Grammar in Use by Raymond Murphy. If you have a copy, consult units 75 [plurals to indicate a category] and 84 [use of "there is/are"] and 2 [present simple for a general truth].