8. I (make) a cake with my mum yesterday. She (play) and (swim) in the river last summer.

Solution:

• The sentence describes past actions, indicated by 'yesterday' and 'last summer'.
• The past simple of 'make' is 'made'.
• The past simple of 'play' is 'played'.
• The past simple of 'swim' is 'swam'.

Answer: I made a cake with my mum yesterday. She played and swam in the river last summer.