Match the elements

An adverbial clause is a subordinate clause which functions as an adverb in a complex sentence. If this type of clause stands at the beginning of the sentence, it should be separated from the main clause by a comma. If the adverbial clause stands after the main sentence, then the comma isn’t used.

If the weather is fine, we will go sightseeing.

We will go sightseeing if the weather is fine.

Although we had watched the film twice before, we didn’t get the message of it.

A non-defining relative clause is a type of clause where the information about the person or thing is not necessary and can be omitted. Usually, this clause is used with commas on both sides.

However, if there is a defining relative clause (where the information is essential and can’t be omitted), a comma isn’t used.

What’s the name of the city where you spent your holiday? (Defining.)

I walk to school with my friend, who lives next door. (Non-defining.)

The party was great,	if they buy tickets.
If I won the lottery,	I would buy a big house.
We know all the people	who work in our company.
They will go to the seaside	where we bought souvenirs.
We visited the museum,	though it finished early.