Mangoes are my favourite fruit.

[Tait-ka]

1. Mangoes are my favourite fruit.
2. Mango is my favourite fruit.
3. My favourite fruit is mango.
4. My favourite fruit is mangoes.

I wrote the above sentences.

Which one would you use in conversation?

 

[BobK]

1. Mangoes are my favourite fruit.
2. Mango is my favourite fruit.
3. My favourite fruit is mango.
4. My favourite fruit is mangoes.

I wrote the above sentences.

Which one would you use in conversation?

I would use 1, but I'm a BE speaker in my mid seventies. 2 and 3 are fine. But 4 is gaining traction in some parts of the world and in some age groups.