1. Use the correct verb form tense (past continuous, present perfect)
     1. When I phoned my friends, they (play) monopoly.

2.     Yesterday at six I (prepare) dinner.

3.     The kids (play) in the garden when it suddenly began to rain.
4.     I haven't seen them ___ last week. (for/since)
5.     I've been working here ___ the beginning of the year. (for/since)
6.He's been learning English ___ a long time. (for/since)                      ​