What do the verbs fit, set, and read have in common?

What the verbs fit, set, and read have in common is that they keep the same form no matter what tense is used.

You can say - I read a book every day. Or Those pants fit you nicely. Or I set the table often.

And if you want to say all that in the past tense, it would look the same:

I read a book yesterday. Those pants fit him nicely a long time ago. I set the table two days ago.