Thyroxine And Decoggestion

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At least in Latin America it is difficult understand the difference between Inside and Inside (or Outside and Outside). Even It was detected very rarely as an error. The following page link elcastellano.org is a full explanation, but as always a bit complicated (at least for me).

Then I tried to summarize:

• INSIDE: when you can replace with "inward", most often with verbs that imply movement. For example: I walk in ( I walk "inward" ). Note that the sentence does not have the preposition "to."

• However, when used the preposition "toward" is preferred to use "Within": I walk inside. What happens is that "Inside", and has implied a preposition (A), so that sounds redudante "inward."
  

• INSIDE: when you can replace with "on the inside." For example: I'm inside the building.

Other useful examples:

• If I'm running into the building : the race is from outside to inside the building. At least in Latin America is more likely to say: 'm running into the building.
  

• If I'm running into the building : the race is the inside of the building.