@milimi,
- I go and visit my friend. 75
,-I go visit my friend. 94
- I go to visit my friend. 38
- I go visiting my friend. 12
The last two open to interpretation: For instance #3 implies there might be several reasons for the trip but in this particular case the most important is the visit
No,. 4 as Dave implies, leaves one dangling. My BH, who is much smarter than I, says, "It's bad English". To me the English is okay but the suggestion is that during his visit he's considering an exit