You may have some bad weather / a bad weather if you go to Cork in March
some bad weather
I think I'll have a time / some time after lunch to help you with that report
some time
John's clothes looks/look very expensive
look
The old town centre is amazing, but the outskirts is/are a bit depressing
are
Hello, Reception? Do you have an / some iron I could use?
an
I really liked the hotel. The staff was/were incredibly friendly.
were
A good city guidebook will give you advice / advices about what to see
advice
In Dublin and Cork, accommodation is/are extremely expensive
is
The flight crew work/works hard to make passengers comfortable
work/works