First conditional vs Unless

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go to the city / visit the museum

• If we

• go to the city

• we

• will

• visit the museum

If you don't study harder, you 'll get bad marks.

=> Unless

If he doesn't practice writing every day, he can't improve his writing skill

=> Unless

Unless you return this book to the library today, you’ll have to pay a fine.

=> If

Unless you go out more often, you might fall ill.

=> If

If you are absent from school, you have to write a sick note.

=> Unless

Unless the sea is warmer, the ice at the North and South poles will not melt.

=> If

If she doesn’t try her best, she will fail this contest.

=> Unless

If you don’t return the money to the missing person, I’ll have to report it to the police.

=> Unless

If that kid doesn’t stop annoying me, I may not let him play in my room.

=> Unless