1. I am afraid, I (forgot) my book at home.
2. Is Diana (coming) to the party tomorrow?
3. Listen! Somebody (is singing) a lovely song.
4. Lucy (has been studying) Russian for two years.
5. Ann (goes) to the cinema every month.
6. The weather is nice today, but it (was) bad yesterday.
7. When you rang me yesterday, I (was having) a bath.
8. I (was playing) tennis at 5 o`clock tomorrow.
9. I (had finished) my work by 6 o`clock tomorrow.
10. When we came to the airport, the plane had already landed.