1. What kind of food can you make?

2. What kinds of food can you make?
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Do we have to use 'kind' or 'kinds'?
Which one do we have to use? Are both OK? Then, is there any difference between them?

Either one will work fine. There's not much difference.

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Both "kind" and "kinds" can be used in this context, but they have slightly different meanings.

1. "What kind of food can you make?" - This is asking about the specific category or type of food that can be made. It implies that there is one category or type being referred to.

2. "What kinds of food can you make?" - This is asking about multiple categories or types of food that can be made. It implies that there are multiple categories or types being referred to.

In general, if you are asking about one specific category or type, you would use "kind," while if you are asking about multiple categories or types, you would use "kinds." However, both forms can be used interchangeably in some cases, and the difference in meaning is relatively subtle.