переставь одну палочку так, чтобы равенства стали верными II-V=III. X-IV=XV

USe the verbs in the past tense 

1)the children  (arrive) at the summer camp yesterday

2)we (learn) about farm animals in the village.

3)some children (swim) in the river last Sunday.

4)my parents (visit )my grandfather two days ago

5)William (send) e mails to his friend on Monday

6)the girls(plays)volleyball in the afternoon.

7)the children (have) a barbecue on the beach last month

8)at night they (sing) songs and(dance) last saturday