Don’t send out the invitations to the party until we know for sure that the band we’ve booked is coming. 5 Sam will buy a new mobile phone when he has saved enough money.

2 Alex has gone to the shops so as to buy a scanner.
3 Mary has kept a copy of the email in case Joe doesn't receive the one she has sent him.
4 John has switched his mobile phone off so as not to annoy the other people in the restaurant.
5 Install an anti-virus programme to protect your computer.
6 Tom has bought extra ink for the printer in order not to run out again.