16 If competition is the best way to achieve it, then, fine.
17 First put the flour in the bowl, and then beat the eggs in.
18 Beat the butter and sugar; then blend in the egg.
19 He had a bath and then went to bed.
20 We went through school and college together, but then our paths diverged.
21 He climbed to the top of the tree and then became afraid to get down.
22 We will then send you an invoice for the total course fees.
23 He couldn't then afford the money to go on the trip.
24 Let's have a rest and then we'll try again.
25 I saw him step forward momentarily but then hang back, nervously massaging his hands.
26 We first make our habits, and then our habits make us.
27 When we know how much is profit, then we can apportion the money among/between us.
28 This is the standard model, then there's the deluxe version which costs more.
29 When war begins, then hell openeth.
30 When war begins then hell opens.