Use when, before or after to join the sentences, as in the example. Use past tenses. 1 Susan waited for an hour. Then her friend arrived.

2 They waited for all the guests before they started eating. (Обе части в Past Simple)
3 Jonathan was walking in the street when he bumped into an old classmate. (Первая часть в Past Continuous,т.к. показан процесс в прошлом, вторая часть в Past Simple)
4 His mum picked him up after he finished school. (Обе части в Past Simple)
5 Beth was mopping the floor when she slipped and fell. (Первая часть в Past Continuous, т.к. показан процесс в прошлом, вторая часть в Past Simple)
6 Nathalie and David lived in a small flat before they moved house. (Обе части в Past Simple)