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ประโยคที่เขียนผิด
Activities that tourists can do is give fishs veterinary food and have a boat service to the river.

ประโยคที่แก้ไขแล้ว
An activity that tourists can do is give fish veterinary food, and there is a boat service to the river.

อยากสอบถามว่า ต้องแก้เป็น.... is giving fish.... ด้วยไหมคะ
มันดูแปลกๆ อ่ะค่ะ

หรือใช้ feeding pond fish แทนได้ไหมคะ

I think for this construction, the infinitive (either with or without ‘to’) is best. We can optionally add ‘to’ here:

An activity that tourists can do is to give fish veterinary food.

Look at the answers to this question on Reddit for a similar example.

https://www.reddit.com/r/grammar/commen ... _hours_of/

However, there are other ways to phrase it where the gerund with –ing fits.

Activities for tourists include feeding the fish and boating.

There are many activities for tourists, such as feeding the fish and boating.

Here the gerund behaves like a noun. This type of construction may make more sense to you as a learner, but the other kind isn’t wrong.

เข้าใจแล้วค่ะอาจารย์ ขอบคุณค่ะ ^___^