We should just teach conversation and writing and the culture, end of story.

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Teacher: Ok class, write about what you did at the weekend.

Class begins writing, "teacher" begins monitoring

Teacher: Very good, Timmy. However we don't say "Yesterday I go to the beach and play with my friends." We say "Yesterday I went to the beach and played with my friends."

Timmy: Oh, ok. Why?

Teacher: Because when we talk about yesterday it's in the past so that means the verbs in the sentence must change to be in the past.

Timmy: Oh, ok. Teacher?

Teacher: Yes, Timmy?

Timmy: What's a verb?

Teacher: It's a doing word. Go and Play are verbs.

Timmy: And why does go become went but play become played? And what about other verbs?

Teacher: Ah, Timmy. That's grammar. You don't need to know about that. Just get on with your writing.