1. ... he does his homework ... ... he did ...
2. ... she likes ... ... she liked...
3. ... he goes ... ... he went...
4. ....he wants... ... he wanted...
5. ... his teacher often speaks... ... his teacher often spoke...
6. ... they don't remember... ... they didn't remember...
7. .... they don't know... ... they didn't know...
8. ... she doesn't understand... ... she didn't understand ...
9. ... the cake tastes wonderful... ... the cake tasted wonderful...
10. .... he feels bad... ... he felt bad...