Error analysis (c) exercise

What, if anything, is wrong with the sentences below?

1 The driver managed to escape from the bus before it sank and swam to the river-bank.
2 No swimming when the red flag is showing – beware strong currants.
3 Girl’s face special problem.
4 This being Easter Sunday, we will ask Mrs. Lewis to come forward and lay an egg on the altar.
5 That is an all together better idea, Tom.
6 Your student loan for the year usually amounts to about £3885 outside London. A room in student accomodation (in halls of residence) usually costs about £45 per week, for 38 weeks. Remember if you pay for a flat (which many students do in their second year) you may have to pay a ‘retaining fee’ over the summer, to ensure you keep your flat for the following year.
7 The patient said the doctor is very ill.
8 10 new choir robes are currently needed, due to the addition of several new members and to the deterioration of some older ones.
9 Friend is studying in Spain.

Corrections