Relative clauses – non-defining relative claus ...

Do we need any commas? Can we skip 'that'? The dish that I ordered was delicious.

Are you the one who sent me the email?

Do we need any commas? While attending an online meeting which is held in Zoom make sure people can't see that you're not wearing pants.

Can we skip 'that'? Do you have anything that will help my sore throat?

Yesterday which was a holiday we visited my relatives in Fastiv.

My next-door neighbors whose children used to go to school with me have just bought a new car.

Do we need any commas? I think anyone who speaks in public is nervous beforehand.

The things that we know best are the things that we haven't been taught.

She offered me a coffee which was just what I needed!

Do we need any commas? There was no snow which was strange for February.

Do we need any commas? Can we skip 'that'? The doctor that I was hoping to see wasn't in the clinic that day.

These are the flights that have been cancelled.

The laptop that I bought last week has started making a strange noise.

Do we need any commas? The passengers whose flights were cancelled got a refund.

Do we need any commas? The week when they were in Lviv was lovely and sunny.

My friend whose dog I'm looking after is visiting a friend in Uzhhorod.

Can we skip 'that'? There's something that you should know.