hi can you please help me with tense changes

[Unregistered]

hi my name is not important but i really need help with my homework on tense changes and who else is better than you to ask for help i only need help[ with one or two and ill be all set please help me.
thank you

 

[Anglika]

Which tense changes?

Give us some idea of what is difficult for you and how you would answer the question.