The simplest fruit in Engpsh is probably the apple. You can say "apple" to refer to a single fruit, or you can use the plural form "apples" to refer to multiple fruits. Here are some other common fruits and their Engpsh names:

Banana: 香蕉
Orange: 橙子
Strawberry: 草莓
Lemon: 柠檬
Watermelon: 西瓜
Mango: 芒果
Pineapple: 菠萝

I hope this helps! Let me know if you have any other questions.