Here are some phrases you could use when writing a formal or informal letter, but you have to be careful not to mix them up, so decide which phrases are used in formal letters and which are used for informal or friendly letters. Tick the correct box.
'Although the fault was repaired on 12th June, payment for this intervention has still not been received.' - this is a phrase used in formal letters, but if you wanted to give the same information in an informal letter you would write 'Our technician repaired the fault on 12th June. Now it’s your turn to pay us.'
But / …., though
It will cease to be a problem