"Pass through" vs "come through" vs "go through"

[zaghum]

Hi,
I am confused about the usage of "Pass through" vs "come through" vs "go through". In the following sentences, which word is ok to use.

1) I (Abc) am standing outside my friend's (xyz) house ringing the door bell and he opens the door.

"Come in/pass through"Abc.I replied, can I "pass through the door/come through the door/come in" with the shoes on.

2) I am outside my professor's room.

Sir may I "come in/pass through".And I use "pass through", will i have to add the door as well or it's redundant

3) I am giving direction to some one.

"Pass through the door/cross the door" and take a left.

 

[Tarheel]

Hi,
I am confused about the usage of "Pass through" vs "come through" vs "go through". In the following sentences, which word is ok to use.

1) I (Abc) am standing outside my friend's (xyz) house ringing the door bell and he opens the door.

"Come in/pass through"Abc.I replied, can I "pass through the door/come through the door/come in" with the shoes on.

If you are the visitor you wouldn't say Come in. You might say, "May I come in (with my shoes on)?"

2) I am outside my professor's room.

Sir may I "come in/pass through".And I use "pass through", will i have to add the door as well or it's redundant

Say: "May I come in?"

3) I am giving directions to someone.

"Pass through the door/cross the door" and take a left.

Say: "Go through the door and take a left."

 

[zaghum]

So when do we use "Pass through".

 

[Tarheel]

So when do we use "Pass through"?

http://www.audioenglish.org/dictionary/pass_through.htm
http://en.wiktionary.org/wiki/pass_through