What happens when on and to become one word

Where the picture shows up in onto

1. 1

   placing on a surface

   Put the box onto the shelf.

   pʊt ðə bɑːks ˈɑːntuː ðə ʃelf

   Set the box on the shelf board.

   the carried box lowers until its bottom sits flat on the shelf board

2. 2

   a body climbing up

   He climbed onto the roof.

   hiː klaɪmd ˈɑːntuː ðə ruːf

   He got up on the roof.

   hands and feet haul the body up until both shoes stand on the roof surface

3. 3

   stepping up onto

   Please step onto the scale.

   pliːz step ˈɑːntuː ðə skeɪl

   Step up on the weighing scale.

   bare feet move across onto the scale plate and the needle wobbles

4. 4

   moving data onto a place

   Copy the file onto this USB drive.

   ˈkɑːpi ðə faɪl ˈɑːntuː ðɪs juː es biː draɪv

   Copy that file to this USB stick.

   a file on the screen slides over and settles into the empty space on the stick

5. 5

   pulling onto a road

   The taxi turned onto Main Street.

   ðə ˈtæksi tɜːrnd ˈɑːntuː meɪn striːt

   The taxi turned into Main Street.

   the rolling taxi cuts its wheels and rides up onto the surface of another street