Grammar errors

In that case you must can to speak the language as well as a native French person.

Can you remember any particular incident when your knowing of the language was a real help?

They have showed to the rest of the world that they are probably the best players.

Do you know the name of the person who speaks at this moment because I don't remember his name.

She's been laying on that couch now for the last six hours and is fast asleep.

It was concluded after the investigation had taken place that nobody was to be regarded as in fault concerning the accident.

It was worse of all in the winter as it was usually dark then.

There were several clients sitting in the surgery waiting to see the doctor.

I've been walking for ages in the pouring rain and as a consequence my clothes is wet through.

The secret to calming yourself down in moments of panic or crisis is simple: just breath slowly in and out a few times.