7+1 Expressions native speakers use in daily conversation

1. "Speaking of / Talking of ..." 
a fixed expression that is used for starting a new topic and linking it to the present one

Example:
"I totally agree. The Mediterranean diet is undoubtedly the healthiest diet in the world as it is abundant in fruits, vegetables, legumes, olive oil ... you can even eat sweets but in moderation. Speaking of food, what's for supper tonight?"

2. "When it comes to (sth / doing sth), ..."
when the specified matter is under consideration 

Example:
When it comes to combatting insomnia, a cup of chamomile tea is the best remedy.

3. "If worst comes to worst, ..." / "If the worst comes to the worst, ..."
in the worst-case scenario; in the worst possible circumstances

Example:
We should be able to catch the 9.30 train, but if worst comes to worst, we could get a taxi and still arrive at the airport on time.

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