The next two weeks passed without Amelia hearing from Godfrey. She was at the point of forgetting him when the phone rang.
"Hi, it's Godfrey," etc.
The reader needs to know that two weeks have passed without Amelia hearing from Godfrey. If we showed this, it would take quite a few pages to cover Amelia's two weeks. Telling is more economical.
After the first kiss, all thoughts of going back were abandoned. They decided to eat at the pub, and spent the evening talking about everything and anything: pets they'd had when children, their favourite things to eat, their families - his mad mother, her dodgy brother - favourite films, bands, books. Everything Godfrey said Amelia thought was incredibly interesting, and by the time they were walking home hand in hand she was half way to being in love.
In this example, exactly what they talked about is irrelevant. What the reader needs to know is that they had an enjoyable evening talking about inconsequential stuff, that Amelia finds Godfrey fascinating and that she's half way to being in love with him.
Similarly, it's OK to describe the room, for example, we don't have to 'show' that there's a table in there. If the character makes a ham sandwich, then tell the reader they make a ham sandwich - you don't have to show them getting out the bread, butter and ham, then buttering the bread etc.
Concentrate on showing the stuff that's important to the story - usually action - and tell the less important stuff.