# These signs will go with those who believe

"People watching those who believe will see these things happen and know that I am with the believers" 

# In my name they

Possible meanings are 1) Jesus is giving a general list: "In my name they will do things like these: They" or 2) Jesus is giving an exact list: "These are the things they will do in my name: They."

# In my name

"By the authority of my name" or "By the power of my name"