at the moment
now; at this time; presently
Example: At the moment I'm reading this example.
Came is the past tense of the irregular verb come. Follow the link to listen to some examples.
more information: come
One way of improving your writing is to know when to write they're, their or there. Follow the link and find out more.
more information: they're their there
switch on
To switch on something is to start it working.
Example: Switch on the TV and see if Nexus is on.
catching up
Catching up is meeting with people you know from the past.